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Omega Speedmaster Professional Moonwatch Moonphase 304.93.44.52.03.002 Unworn Ceramic 44.25mm Automatic United Kingdom, Fareham
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Omega Speedmaster Blue Side of the Moon - Aventurine Dial
£10,750
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4.70 (29)
UK
Rolex Submariner Date 116610LV Very good Steel 40mm Automatic
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Rolex Submariner Date "Hulk" 40mm Automatic Green Ceramic Ref:...
£29,112
+ £87 for shipping
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4.88 (337)
RO
Rolex Datejust 41 126334 Very good Steel 41mm Automatic
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Rolex 2020 New Card Rolex Datejust 41 126334 Blue 18k White...
£11,740
+ £64 for shipping
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4.89 (161)
US
Ulysse Nardin San Marco 133-77 Very good Steel 37mm Automatic
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Ulysse Nardin San Marco Date Blue Dial 37mm Rubber Ref: 133-77
£1,825
+ £87 for shipping
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4.88 (337)
RO
Omega Seamaster Diver 300 M 2254.50.00 Very good Steel 41mm Automatic
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Omega Seamaster Professional 300M Automatik Herrenuhr Ref....
£2,911
+ £78 for shipping
Sold by Chrono24
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Rolex Lady-Datejust 69173 Very good Steel 26mm Automatic
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Rolex Ladies Rolex Datejust Mother Of Pearl Ruby 18k Gold &...
£4,928
+ £64 for shipping
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4.89 (161)
US
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic
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Rolex Sea-Dweller
£15,654
+ £81 for shipping
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Cartier Roadster Very good Steel 47mm Automatic
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Cartier Roadster Xl W62020x6 Black Dial Stainless Steel Fully...
£16,143
+ £81 for shipping
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4.78 (498)
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Rolex Datejust 36 1601 Very good Steel 36mm Automatic
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Rolex Datejust 1601 Vintage 1970 Solid White Gold Bezel Mens...
£4,390
+ £79 for shipping
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4.89 (55)
US
Breitling Superocean II 44 A17392D7/BD68 New Steel 44mm Automatic United Kingdom, London SW3 1NX
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Breitling Superocean II 44 Steel - ref A17392D7/BD68
£3,685
+ £90 for shipping
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4.86 (98)
UK
Rolex Datejust 41 126334 New Steel 41mm Automatic United Kingdom, Fareham
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Rolex Blue Dial Datejust 41 - 2022 card - 126334 - Fluted Bezel -
£12,800
+ £43 for shipping
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4.94 (105)
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Rolex Submariner Date 126610LN New Steel 41mm Automatic United Kingdom, Surrey
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Rolex 2021 Submariner Date 41mm Unworn Box And Papers 126610LN
£14,750
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UK
Rolex Submariner (No Date) 124060 New Steel 41mm Automatic United Kingdom, CH60 7RJ
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Rolex Submariner No Date March 2022 New & Unworn 124060
£13,295
+ £50 for shipping
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4.92 (26)
UK
Omega Seamaster Aqua Terra 2503.34.00 Very good Steel 39mm Automatic
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Omega Seamaster Aqua Terra Chronometer Automatik Stahl...
£2,564
+ £78 for shipping
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Rolex Submariner Date 16610 T Fair Steel 40mm Automatic
Rolex "Kermit" Ghost Bezel 16610T Stainless Steel w/ Box & Paper
£14,268
+ £122 for shipping
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4.92 (19)
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Bremont MB MBII-BK/OR Very good Steel 43mm Automatic United Kingdom, Wilmslow
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Bremont Martin Baker II Orange Side 2019 SERVICED BY BREMONT
£3,155
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4.96 (379)
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Cartier Roadster W62020X6 Very good Steel 47mm Automatic
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Cartier Roadster XL Chronograph Stainless Steel Diamond Watch...
£10,762
+ £81 for shipping
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4.78 (498)
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Omega Seamaster Diver 300 M 212.30.41.20.03.001 Very good Steel 41mm Automatic United Kingdom, Borth
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Omega Seamaster 300M Co-Axial 212.30.41.20.03.001
£3,495
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5.00 (7)
UK
Breitling for Bentley AB0118A11L1A1 New Steel 42mm Automatic United Kingdom, London
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Breitling Premier B01 Chronograph 42 Bentley British Racing...
£5,666
+ £90 for shipping
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4.86 (98)
UK
Rolex Submariner Date 126610LN New Steel 41mm Automatic United Kingdom, Hayling Island
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Rolex Submariner Black Dial Date 41mm - 2021 - 126610LN
£14,000
+ £43 for shipping
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4.94 (105)
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Rolex Datejust 41 126334 New White gold 41mm Automatic United Kingdom, Surrey
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Rolex 2021 Datejust 41 Blue Dial Unworn Box And Papers 126334
£11,995
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UK
Rolex Yacht-Master II 116688-0002 Unworn Yellow gold 44mm Automatic United Kingdom, London
Rolex Yacht-Master II 116688 | Unworn | Full Set 2022
£46,500
+ £14 for shipping
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4.95 (76)
UK
Omega Constellation 1302.10.00 Very good Gold/Steel 35.5mm Automatic
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Omega Constellation Stahl / Gold Automatik Herrenuhr Ref....
£2,477
+ £78 for shipping
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Tudor Black Bay GMT 79830RB Very good Steel 41mm Automatic
Tudor Black Bay GMT 'Pepsi' 41mm Stainless Steel 79830RB w/ B&P
£3,628
+ £82 for shipping
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4.92 (19)
US
Rolex Datejust 41 126334 Unworn Steel 41mm Automatic United Kingdom, St Albans
Rolex Datejust 41 Wimbledon - 2021 Unworn - Partial Stickers
£13,550
+ £15 for shipping
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4.88 (47)
UK
Breitling Super Avenger A13370 Very good Steel 48mm Automatic
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Breitling Super Avenger SS Chronograph White Dial Diamond Set...
£8,397
+ £81 for shipping
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4.78 (498)
US
Rolex Submariner (No Date) 124060 Very good Steel 41mm Automatic United Kingdom, Bishop's Stortford
Rolex Submariner Non Date Stainless Steel 124060 - Manufacture...
£13,999
Free shipping
Sold by Chrono24
UK
Breitling Endurance Pro X82310D91B1S1 New Plastic 44mm Quartz United Kingdom, London SW3 1NX
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Breitling Endurance Pro - X82310D91B1S1
£3,037
+ £90 for shipping
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4.86 (98)
UK
Rolex Submariner (No Date) 124060 New Steel 41mm Automatic United Kingdom, Fareham
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Rolex Submariner No date - 2022 - 124060
£12,600
+ £43 for shipping
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4.94 (105)
UK
Rolex Datejust 41 126334 Very good Steel 41mm Automatic United Kingdom, London
Rolex Datejust 41 126334 Tiffany Coloured Dial - Box & Papers...
£14,495
+ £30 for shipping
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4.90 (335)
UK

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Chopard Mille Miglia 168565-3001 Very good Steel 43mm Automatic United Kingdom, Oxford
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Chopard Mille Miglia GTS Automatic - Box & Papers 2017
£3,350
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4.94 (281)
UK
Omega Seamaster Planet Ocean 232.32.44.22.01.002 Unworn Steel 43.5mm Automatic
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Omega Seamaster Planet Ocean 600M GMT Co-Axial 232.32.44.22.01...
£4,606
+ £139 for shipping
Sold by Chrono24
DE
Ulysse Nardin Marine Chronometer Manufacture 1185-126-3T/45 Very good Gold/Steel 43mm Automatic
Ulysse Nardin Marine Chronometer Manufacture
£5,707
+ £82 for shipping
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4.92 (19)
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Rolex Datejust 41 126334 Unworn Steel 41mm Automatic United Kingdom, St Albans
Rolex Datejust 41 Wimbledon - 2022 Unworn
£13,950
+ £15 for shipping
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4.88 (47)
UK
Cartier Roadster W62020X6 Very good Steel 47mm Automatic
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Cartier Roadster XL Chronograph Stainless Steel Diamond Watch...
£7,175
+ £81 for shipping
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4.78 (498)
US
Rolex Day-Date 36 118206 Very good Platinum 36mm Automatic United Kingdom, Bishop's Stortford
Rolex Day-Date 36 Meteorite Dial Platinum 118206 - Just...
£39,999
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UK
Breitling Avenger V32395101/B1X1 New Titanium 45mm Automatic United Kingdom, London
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Breitling Avenger Automatic GMT 45 Night Mission - ref...
£3,840
+ £90 for shipping
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4.86 (98)
UK
Rolex Sea-Dweller 126600 New Steel 43mm Automatic United Kingdom, Fareham
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Rolex Sea-Dweller -126600 Red Writing
£14,000
+ £43 for shipping
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4.94 (105)
UK
Tudor Black Bay Chrono M79360N-0002 New Steel 41mm Automatic United Kingdom, Keighley
Tudor Black Bay Chrono 41mm 79360N Steel White Panda Dial Uk...
£6,950
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5.00 (4)
UK
Omega Speedmaster Racing 329.33.44.51.04.001 Very good Steel Automatic United Kingdom, London
Omega Speedmaster Racing 329.33.44.51.04.001 - Box & Papers -...
£5,045
+ £30 for shipping
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4.90 (335)
UK
Omega Seamaster 522.23.39.20.02.001 Very good Steel 39mm Automatic
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Omega Seamaster Olympic Collection London 2012 Co-Axial...
£4,910
+ £139 for shipping
Sold by Chrono24
DE
Panerai Luminor Submersible PAM 00087 Good Steel 44mm Automatic
Panerai Luminor Submersible PAM00087 Blue Dial w/ Complete Set
£7,745
+ £82 for shipping
Professional dealer
4.92 (19)
US
Rolex Submariner Date 126610LN Very good Steel 41mm Automatic United Kingdom, St Albans
Rolex Submariner Date - 2021 Full Set
£14,950
+ £15 for shipping
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4.88 (47)
UK
Cartier Roadster Very good Steel 47mm Automatic
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Cartier Roadster Xl W62020x6 Silver Dial Stainless Steel Fully...
£16,143
+ £81 for shipping
Professional dealer
4.78 (498)
US
Omega Speedmaster Professional Moonwatch 31192445101003 Very good Ceramic 44.2mm Automatic United Kingdom, Bishop's Stortford
Omega Speedmaster Co-Axial Chronograph Dark Side of The Moon...
£7,499
Free shipping
Sold by Chrono24
UK
Rolex Sea-Dweller 126600 New Steel 43mm Automatic United Kingdom, London SW3 1NX
Rolex Sea-Dweller Steel 126600
£16,200
+ £90 for shipping
Professional dealer
4.86 (98)
UK
Omega Speedmaster Professional Moonwatch 310.20.42.50.01.001 Very good Steel 42mm Manual winding United Kingdom, London
Omega Speedmaster FULL SET Professional Moonwatch Apollo 11...
£12,295
+ £25 for shipping
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4.98 (431)
UK
Omega Constellation 168.025 Good Steel 34mm Automatic United Kingdom, Ayrshire Scotland
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Omega Vintage Rare 1970 Pie Pan Constellation one piece...
£1,495
+ £10 for shipping
Professional dealer
4.99 (70)
UK
Rolex Submariner Date 126610LN New Steel 41mm Automatic United Kingdom, London
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Rolex 2021 Submariner Date 41mm Unworn Full Set 126610LN
£13,950
+ £43 for shipping
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4.85 (23)
UK
Breitling Starliner A71340 Very good Steel 30mm Quartz
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Breitling Starliner Lady MOP Chronometer Datum Edelstahl...
£2,416
+ £78 for shipping
Sold by Chrono24
DE
Rolex Submariner (No Date) 124060 Unworn Steel 41mm Automatic United Kingdom, London
Rolex Submariner Non-Date 124060 - Box & Papers - Rolex...
£12,995
+ £30 for shipping
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4.90 (335)
UK
Breitling Colt Automatic A1738811/C906-173A Very good Steel 44mm Automatic United Kingdom, St Albans
Breitling Colt Automatic - Box & Papers 2017
£2,350
+ £15 for shipping
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4.88 (47)
UK
Cartier Roadster W62020X6 Very good Steel 47mm Automatic
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Cartier Roadster XL Chronograph Stainless Steel Diamond Watch...
£9,863
+ £81 for shipping
Professional dealer
4.78 (498)
US
Omega Seamaster Planet Ocean 232.90.46.21.03.001 Good Titanium 45.5mm Automatic United Kingdom, Bishop's Stortford
Omega Planet Ocean Titanium 232.90.46.21.03.001 - Accredited...
£4,999
Free shipping
Sold by Chrono24
UK
Breitling Avenger II A1338111/BC32-170A New Steel 43mm Automatic United Kingdom, London SW3 1NX
Breitling Avenger II Steel - ref A1338111/BC32
£4,382
+ £90 for shipping
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4.86 (98)
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Breitling Navitimer RB0910371B1X1 Good Rose gold Automatic United Kingdom, Leicester
Breitling Navitimer 1959 Edition
£16,950
+ £10 for shipping
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4.95 (78)
UK
Omega Constellation 168.017 Good Steel 34mm Automatic United Kingdom, Ayrshire Scotland
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Omega Vintage 1964 C shaped Steel constellation with calendar,...
£995
+ £10 for shipping
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4.99 (70)
UK
Rolex Sea-Dweller 126600 New Steel 43mm Automatic United Kingdom, Keighley
Rolex Sea-Dweller SD43 "RED" 126600 50th Anniversary Unworn...
£15,950
Free shipping
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5.00 (4)
UK
Omega Seamaster Planet Ocean 232.30.42.21.01.003 Very good Steel 42mm Automatic
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Omega Seamaster Planet Ocean 600M Automatik 232.30.42.21.01.00...
£4,302
+ £78 for shipping
Sold by Chrono24
DE
Rolex Submariner Date 126610LN Unworn Steel 41mm Automatic United Kingdom, London
Rolex Submariner Date 126610LN - Box & Papers - Rolex Warranty...
£13,995
+ £30 for shipping
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4.90 (335)
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Omega Seamaster Diver 300 M 210.30.42.20.03.001 New Steel 42mm Automatic United Kingdom, London
Omega Seamaster 2022 NEW Diver 300M Co‑Axial Master Chronomete...
£3,885
+ £25 for shipping
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4.98 (431)
UK
Breitling Superocean Chronograph II M13341B7/BD11 Very good Steel 44mm Automatic United Kingdom, Shrewsbury
Breitling Superocean Chronograph Black Ii Mens Watch
£2,999
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4.93 (84)
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Omega Seamaster Diver 300 M 210.30.42.20.06.001 Unworn Steel 42mm Automatic United Kingdom, Bishop's Stortford
Omega Seamaster Stainless Steel 210.30.42.20.06.001 - Manufact...
£3,599
Free shipping
Sold by Chrono24
UK
Breitling AB0118221B1P1 New Steel 42mm Automatic United Kingdom, London SW3 1NX
Breitling Premier B01 Chronograph 42 AB0118221B1P1
£6,253
+ £90 for shipping
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4.86 (98)
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Chronometer - Certified Precision

"Chronometer" may sound like a fancy name for a normal watch - after all, it just comes from the Greek words for "time" and "measure" - but chronometers are really something quite special. Chronometers are watches, yes, but watches that have been tried and tested and certified to meet exacting precision standards. The COSC in Switzerland determines which watches may actually call themselves "chronometers".


The Oceanic Origins of Chronometers

Though the Swiss set the standard, the English coined the word. In the quest to calculate the longitude, the Englishman Jeremy Thacker, a clockmaker of extraordinary skill, created a series of increasingly accurate clocks, well beyond what had had previously been achieved. The clocks were intended to be used aboard ships and had to keep absolutely accurate time in order to allow for calculating longitude precisely, and thus fixing the position of the ship in the vast ocean. The last of Thacker's chronometers was actually more like a very large pocket watch.

Other clockmakers - and increasingly watchmakers - copied from and improved upon Thacker's final chronometer, producing watches of greater and greater precision. The original standards for accuracy were actually far more exacting than those currently maintained by the COSC in Switzerland, so very few watches were certified as chronometers and thus very few were actually produced and sold. The original chronometer requirements for mechanical watches are no longer necessary, since digital watches can already exceed them, but chronometers are still manufactured and sold (and resold) today as examples of extremely fine precision engineering. The use of jewels and precious metals in watches owes its origins to chronometers - these materials were used to make the mechanical movements as precise as possible.


Officially Certified Chronometers

Chronometers are no longer rare. More than a million Officially Certified Chronometer certificates are issued each year. Those watches that pass the most rigorous of the COSG's tests are rewarded with a special serial number and, indeed, the right to call themselves "chronometers" at all. Chronometers must meet several requirements: they must display the seconds; they must be highly precise; they must demonstrate that precision over the course of several consecutive days of testing; they must perform precisely in different positions and at different temperatures.


Chronometers in Everyday Use

This may sound extreme, but such reliability was crucial for individuals and groups that had to rely on the precision of portable mechanical timekeepers in the past. Pilots watches, for instance, needed to perform as chronometers (and those that did not had to be hackable). The famous B-Uhren, commissioned by the German Luftwaffe and manufactured by several companies, were chronometer-certified pilots watches - or chronometers that were used as pilots watches, depending on your perspective. Interestingly, despite the many years between Thacker's invention and the production of the B-Uhren, chronometers were still tightly bound to use in navigation.

First at sea, then in the air. And, still today, at sea again - or at least under it. Some diving watches, like the Rolex submariner, are also certified chronometers. Divers must be able to reliably track how long they've been under and how much time they have to surface.

Though their accuracy may have been eclipsed by digital watches, chronometers are still useful today.