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Breitling Starliner K71340 - Diamond Set - Box & Paperwork 2010
TOP
Breitling Starliner K71340 - Diamond Set - Box & Paperwork 2010
£9,325
Seller
Mark Worthington Jewellers
122
UK
Breitling Navitimer K23322 - Serviced By Breitling
TOP
Breitling Navitimer K23322 - Serviced By Breitling
£16,615
Seller
Mark Worthington Jewellers
122
UK
Rolex Datejust
TOP
Rolex Datejust
£8,295
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Jopsons Jewellers
43
UK
Omega Speedmaster Professional Moonwatch Moonphase Blu New 2018
TOP
Omega Speedmaster Professional Moonwatch Moonphase Blu New 2018
£7,173
Seller
D. & E. Luxury Watches
139
IT
Rolex GMT-Master II 116758SARU
Rolex GMT-Master II 116758SARU
£115,000
Free shipping
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Watches & Jewellery of Bond Street Ltd
245
UK
Omega Seamaster 007 James Bond 50th Anniversary
Omega Seamaster 007 James Bond 50th Anniversary
£3,200
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W1 Watches
60
UK
TAG Heuer Watch Grand Carrera CAV5185.FT6020
TAG Heuer Watch Grand Carrera CAV5185.FT6020
£3,750
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Watchfinder.co.uk Ltd
UK
Omega 212.30.41.20.03.001
Omega 212.30.41.20.03.001
£2,278
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Your Luxury Time LTD
382
UK
Omega Seamaster Planet Ocean 600M Co-axial Master Chronometer
Omega Seamaster Planet Ocean 600M Co-axial Master Chronometer
£3,715
Free shipping
Seller
ChronoEdge
174
UK
Breitling Bentley Motors blue dial limited Chronograph with...
TOP
Breitling Bentley Motors blue dial limited Chronograph with...
£3,049
Seller
The Watch Firm
245
AT
Omega Unworn Seamaster Diver Black 300m Co-Axial
Omega Unworn Seamaster Diver Black 300m Co-Axial
£2,495
Free shipping
Seller
fitzroviawatches.co.uk
144
UK
Breitling Bentley Motors Special Edition
TOP
Breitling Bentley Motors Special Edition
£3,399
Seller
Private Seller
 
UK
Rolex Explorer II Steve McQueen 1655
Rolex Explorer II Steve McQueen 1655
£19,950
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
245
UK
Breitling Super Avenger Black steel M13370
Breitling Super Avenger Black steel M13370
£2,300
Seller
W1 Watches
60
UK
Omega Seamaster Aqua Terra
TOP
Omega Seamaster Aqua Terra
£2,995
Seller
Jopsons Jewellers
43
UK
Omega Watch Seamaster 300m 2254.50.00
Omega Watch Seamaster 300m 2254.50.00
£2,650
Seller
Watchfinder.co.uk Ltd
UK
Omega 212.30.41.20.01.003
Omega 212.30.41.20.01.003
£2,278
Seller
Your Luxury Time LTD
382
UK
Omega Seamaster “Railmaster” 150M Co-axial Master Chronometer
Omega Seamaster “Railmaster” 150M Co-axial Master Chronometer
£2,975
Free shipping
Seller
ChronoEdge
174
UK
Rolex Submariner "Red Depth" Units Only Stainless Steel 6538 -...
Rolex Submariner "Red Depth" Units Only Stainless Steel 6538 -...
Price on request
Seller
Xupes.com
170
UK
Breitling Chronomat 41 18KT RG SS CB0140
Breitling Chronomat 41 18KT RG SS CB0140
£5,995
Free shipping
Seller
fitzroviawatches.co.uk
144
UK
Rolex Sea-Dweller 43 with Box and Papers
Rolex Sea-Dweller 43 with Box and Papers
£10,395
Seller
Charles Fish
101
UK
Rolex Rare Omani Crest Submariner 1680
Rolex Rare Omani Crest Submariner 1680
£55,000
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
245
UK
Breitling Super Avenger II
Breitling Super Avenger II
£2,900
Seller
W1 Watches
60
UK
Breitling Chronomat Crosswind 18K Solid Gold Automatic
Breitling Chronomat Crosswind 18K Solid Gold Automatic
£13,995
Seller
Swiss Time London
7
UK
Omega Watch Seamaster 300m 2220.80.00
Omega Watch Seamaster 300m 2220.80.00
£2,750
Seller
Watchfinder.co.uk Ltd
UK
Omega Seamaster Planet Ocean 215.33.44.21.03.001
Omega Seamaster Planet Ocean 215.33.44.21.03.001
£3,677
Seller
Your Luxury Time LTD
382
UK
Omega Globemaster Co-axial Master Chronometer Annual Calendar
Omega Globemaster Co-axial Master Chronometer Annual Calendar
£4,975
Free shipping
Seller
ChronoEdge
174
UK
Rolex Submariner Stainless Steel Men's 16800 - W5292
Rolex Submariner Stainless Steel Men's 16800 - W5292
£6,995
Seller
Xupes.com
170
UK
Omega Speedmaster Dark side of the Moon 311.92.44.51.01.003
Omega Speedmaster Dark side of the Moon 311.92.44.51.01.003
£5,495
Free shipping
Seller
fitzroviawatches.co.uk
144
UK
Rolex Yacht-Master II
TOP
Rolex Yacht-Master II
£29,467
Seller
Prestige Luxusuhren GmbH
4142
DE
Rolex Datejust 79178
Rolex Datejust 79178
£6,950
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
245
UK
Breitling Transocean Unitime Pilot AB0510 Chrono
Breitling Transocean Unitime Pilot AB0510 Chrono
£3,750
Seller
W1 Watches
60
UK
Rolex Datejust 41mm 126334 Silver
Rolex Datejust 41mm 126334 Silver
£6,750
Seller
Swiss Time London
7
UK
Omega Watch Seamaster 300m 212.30.41.20.03.001
Omega Watch Seamaster 300m 212.30.41.20.03.001
£2,150
Seller
Watchfinder.co.uk Ltd
UK
Breitling Navitimer 1 ​​AB012721/BD09/441X
Breitling Navitimer 1 ​​AB012721/BD09/441X
£4,448
Seller
Your Luxury Time LTD
382
UK
Omega Globemaster Co-axial Master Chronometer Annual Calendar
Omega Globemaster Co-axial Master Chronometer Annual Calendar
£6,250
Free shipping
Seller
ChronoEdge
174
UK
Rolex Submariner Tropical Dial Stainless Steel Men's 5513 - W5323
Rolex Submariner Tropical Dial Stainless Steel Men's 5513 - W5323
£29,995
Seller
Xupes.com
170
UK
Breitling for Bentley 24HR Ltd Ed AB022022BC84
Breitling for Bentley 24HR Ltd Ed AB022022BC84
£3,995
Free shipping
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fitzroviawatches.co.uk
144
UK
Ulysse Nardin Marine Chronometer 41mm
Ulysse Nardin Marine Chronometer 41mm
£6,636
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Elite Chrono Ltd.
290
UK
Rolex GMT-Master II 16713
Rolex GMT-Master II 16713
£6,750
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
245
UK
Breitling Bentley 6.75 A44362 complete box and papers 2005...
Breitling Bentley 6.75 A44362 complete box and papers 2005...
£3,550
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W1 Watches
60
UK
Rolex Datejust 41mm Rolesor Jubilee
Rolex Datejust 41mm Rolesor Jubilee
£7,850
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Swiss Time London
7
UK
Omega Watch Planet Ocean 2201.50.00
Omega Watch Planet Ocean 2201.50.00
£2,750
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Watchfinder.co.uk Ltd
UK
Breitling Navitimer World A2432212/C651/101X/A20BA.1
Breitling Navitimer World A2432212/C651/101X/A20BA.1
£3,632
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Your Luxury Time LTD
382
UK
Omega Speedmaster 38 Orbis Co-axial Chronograph324.30.38.50.03...
Omega Speedmaster 38 Orbis Co-axial Chronograph324.30.38.50.03...
£2,950
Free shipping
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ChronoEdge
174
UK
Rolex Submariner Stainless Steel Men's 1680 - COM1643
Rolex Submariner Stainless Steel Men's 1680 - COM1643
£11,995
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Xupes.com
170
UK
Breitling for Bentley Mark VI P26362 Platinum Bezel
Breitling for Bentley Mark VI P26362 Platinum Bezel
£4,495
Free shipping
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fitzroviawatches.co.uk
144
UK
Lip Gilt Chronograph
TOP
Lip Gilt Chronograph
£4,350
Seller
Private Seller
 
UK
Rolex Daytona Diamond & Sapphire 116599SA
Rolex Daytona Diamond & Sapphire 116599SA
£69,500
Free shipping
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Watches & Jewellery of Bond Street Ltd
245
UK
TAG Heuer Carrera Calibre 8
TAG Heuer Carrera Calibre 8
£1,750
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W1 Watches
60
UK
Breitling Chronomat 44 CB011012
Breitling Chronomat 44 CB011012
£8,800
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Swiss Time London
7
UK
Panerai Watch Luminor 1950 PAM00127
Panerai Watch Luminor 1950 PAM00127
£12,750
Seller
Watchfinder.co.uk Ltd
UK
Omega Speedmaster Professional Moonwatch Moonphase
Omega Speedmaster Professional Moonwatch Moonphase
£5,874
Seller
Your Luxury Time LTD
382
UK
TAG Heuer Carrera Automatic Calibre 8 GMT WAR5010.BA0723
TAG Heuer Carrera Automatic Calibre 8 GMT WAR5010.BA0723
£1,650
Free shipping
Seller
ChronoEdge
174
UK
Omega Constellation 18K Yellow Gold Men's CD168017 - COM1544
Omega Constellation 18K Yellow Gold Men's CD168017 - COM1544
£4,995
Seller
Xupes.com
170
UK
Rolex Unworn Full Set Rolex Sea-Dweller 126600 Stainless Steel
Rolex Unworn Full Set Rolex Sea-Dweller 126600 Stainless Steel
£11,500
Free shipping
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WatchCollectors.co.uk
35
UK
Rolex Lady-Datejust Pearlmaster Special Edition NEW
TOP
Rolex Lady-Datejust Pearlmaster Special Edition NEW
£23,237
Seller
NoblesseWatch
139
UK
Rolex Datejust Gold Ladies Bark Finish Diamond Set 69288
Rolex Datejust Gold Ladies Bark Finish Diamond Set 69288
£7,250
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
245
UK
Breitling Colt Quartz steel bracelet A74388 mint
Breitling Colt Quartz steel bracelet A74388 mint
£1,650
Seller
W1 Watches
60
UK
Omega Museum Milestone
Omega Museum Milestone
£8,950
Seller
Swiss Time London
7
UK
Omega Watch Seamaster 300m 2220.80.00
Omega Watch Seamaster 300m 2220.80.00
£2,850
Seller
Watchfinder.co.uk Ltd
UK
Breitling Transocean Day & Date  A4531012/G751/437X/A20BA.1
Breitling Transocean Day & Date A4531012/G751/437X/A20BA.1
£3,000
Seller
Your Luxury Time LTD
382
UK
Omega Seamaster Planet Ocean Chronograph Titanium Co-Axial 600M
Omega Seamaster Planet Ocean Chronograph Titanium Co-Axial 600M
£4,650
Free shipping
Seller
ChronoEdge
174
UK
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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.

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