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Rolex Daytona 116506 New Platinum 40mm Automatic
TOP
Rolex Cosmograph Daytona
£61,185
Verified Dealer
185
DE
Chopard Grand Prix de Monaco Historique 168569-3001 Very good Titanium 45mm Automatic
TOP
Chopard GRAND PRIX DE MONACO HISTORIQUE POWER CONTROL FULL SET
£3,209
Verified Dealer
99
PL
Rolex Lady-Datejust Pearlmaster 69318 Very good Yellow gold 29mm Automatic United Kingdom, London
TOP
Rolex Pearlmaster Datejust 69318
£13,250
Free shipping
Verified Dealer
472
UK
Breitling Chrono-Matic 49 M1436003/BA67/201S Unworn Steel 49mm Automatic
TOP
Breitling Chrono-Matic 49 Blacksteel Limited Edition
£6,029
Verified Dealer
215
DE
Chopard Superfast 168523-3001 Very good Steel 45mm Automatic
TOP
Chopard SuperFast Chronograph Mint Box Papers ON SALE
£2,641
Free shipping
Verified Dealer
140
US
Eberhard & Co. 30132 Unworn Yellow gold 37mm Automatic United Kingdom, Hertfordshire
TOP
Eberhard & Co. Champion, 37mm, 18k gold, NOS (full set), 1993,...
£5,395
Verified Dealer
18
UK
Rolex Oyster Perpetual Date 15200 Very good Steel 34mm Automatic United Kingdom, Manchester
Rolex Oyster Perpetual Date 15200 34mm Black Dial
£3,550
Free shipping
Verified Dealer
40
UK
Rolex Yacht-Master II 116688 Unworn Yellow gold 44mm Automatic United Kingdom, London
Rolex Yacht-Master II 116688
£30,950
Free shipping
Verified Dealer
472
UK
Rolex Datejust 126334 New Steel 41mm Automatic United Kingdom, London
Rolex Datejust 41 Oyster Rhodium Dial 2019 New
£8,250
Verified Dealer
31
UK
Chopard L.U.C 168561-3001 Unworn Steel 43mm Automatic
Chopard L.U.C PERPETUAL TWIN
£16,808
Verified Dealer
267
IT
Omega Constellation Very good Yellow gold Automatic United Kingdom, London
Omega Constellation ‘Pie Pan’ 18ct 1962 on Original 18ct Bracelet
£6,800
Free shipping
Verified Dealer
12
UK
Ulysse Nardin Marine Chronometer Manufacture 1183-126-3/43 Very good Steel 43mm Automatic United Kingdom, Oxford
TOP
Ulysse Nardin Marine Chronometer 1183-126 43mm
£3,950
Verified Dealer
182
UK
Rolex Datejust 126334 Very good Steel 41mm Automatic United Kingdom, London
Rolex Datejust 41 | Blue Dial Jubilee
£8,400
Verified Dealer
 
UK
Omega Speedmaster Racing 326.30.40.50.02.001 Unworn Steel 40mm Automatic
Omega Speedmaster Racing 40mm White Steel 326.30.40.50.02.001 201
£2,292
Verified Dealer
669
US
Rolex Datejust 126334 Unworn Steel 41mm Automatic United Kingdom, Wilmslow
Rolex Datejust 41mm Rhodium Dial 2019 UNWORN
£9,370
Verified Dealer
262
UK
Omega Seamaster Planet Ocean Chronograph 215.30.46.51.03.001 Good Steel 45.5mm Automatic United Kingdom, Manchester
Omega Seamaster Planet Ocean Chronograph 215.30.46.51.03.001
£4,650
Free shipping
Verified Dealer
40
UK
Rolex GMT-Master II 16710 Unworn Steel 40mm Automatic United Kingdom, London
Rolex GMT-Master II NOS Coke 16710
£14,950
Free shipping
Verified Dealer
472
UK
Rolex Datejust 126334 New Steel 41mm Automatic United Kingdom, London
Rolex Datejust 41 Blue Roman Numeral Dial New
£8,995
Verified Dealer
31
UK
Breitling Navitimer 1 B01 Chronograph 43 AB01219A1G1X2 New Steel 43mm Automatic
Breitling NAVITIMER 1 B01 CHRONOGRAPH 43 AIRLINE EDITION - TWA
£5,035
Verified Dealer
267
IT
S5023 New Steel 43mm Automatic
Heli Reymond Swiss Automatic Chronograph Men's Watch Active...
£2,331
Free shipping
Verified Dealer
 
US
Omega Speedmaster Professional Moonwatch 31192445101007 Ceramic 44.5mm Automatic United Kingdom, London
Omega 31192445101007 Speedmaster Dark Side of the Moon -...
£6,950
Free shipping
Verified Dealer
119
UK
Omega Constellation Ladies 123.10.27.20.51.001 Unworn Steel 27mm Automatic United Kingdom, WARRINGTON
Omega Constellation Ladies 123.10.27.20.51.001
£2,499
Verified Dealer
 
UK
Omega Speedmaster Professional Moonwatch 310.20.42.50.01.001 New Steel Manual winding United Kingdom, London
Omega Apollo 11 50th Anniversary Speedmaster Moonwatch Limited
£10,250
Verified Dealer
147
UK
Breitling Bentley Motors A25362 Very good Steel 48mm Automatic United Kingdom, Wilmslow
Breitling Bentley for Bentley Motors A25362 - Serviced By...
£4,680
Verified Dealer
262
UK
Rolex GMT-Master II 126710BLNR-0002 New Steel 40mm Automatic United Kingdom, Manchester
Rolex GMT-Master II 126710BLNR UK 2020 Batman Batgirl
£14,000
Free shipping
Verified Dealer
40
UK
Rolex Submariner Date 116610LV Unworn Steel 40mm Automatic United Kingdom, London
Rolex Submariner Hulk 116610LV
£11,950
Free shipping
Verified Dealer
472
UK
Omega Globemaster 130.23.41.22.06.001 Unworn Gold/Steel Automatic United Kingdom, London
Omega Globemaster Annual Calendar 18KT Bezel 130.23.41.22.06.001
£4,750
Free shipping
Verified Dealer
211
UK
Breitling Super Avenger II A1337111/BC28/443X/A20BA.1 New Steel 48mm Automatic
Breitling SUPER AVENGER II
£3,485
Verified Dealer
267
IT
Rolex Datejust 278343RBR New Gold/Steel 31mm Automatic
Rolex Datejust 31 Midsize Gold / Steel Diamonds NEW
£12,084
Verified Dealer
1317
NL
Rolex Sea-Dweller 126600 Steel 43mm Automatic United Kingdom, London
Rolex 126600 Sea-Dweller 43 Mark I - Anniversary Full Set
£12,500
Free shipping
Verified Dealer
119
UK
Omega Constellation 168 010/11 Very good Yellow gold Automatic United Kingdom, London
Omega Constellation Cal.564 18ct 1967, Solid Gold Dial
£3,500
Free shipping
Verified Dealer
12
UK
Breitling K13350 Very good Yellow gold 40.5mm Automatic United Kingdom, Hove
TOP
Breitling Chronomat Evolution 18K Gold
£13,750
Private Seller
 
UK
Rolex Datejust 126334 Very good Gold/Steel 41mm Automatic United Kingdom, Wilmslow
Rolex Datejust 41 126334 Black Diamond Jubilee 2018
£9,370
Verified Dealer
262
UK
Rolex Datejust 116233 Very good Gold/Steel 36mm Automatic United Kingdom, Manchester
Rolex Datejust 116233 36mm 2018 Jubilee
£8,900
Free shipping
Verified Dealer
40
UK
Rolex Daytona 116500LN Unworn Steel 40mm Automatic United Kingdom, London
Rolex Daytona 116500LN
£21,950
Free shipping
Verified Dealer
472
UK
Rolex GMT-Master 1675 Good Steel 40mm Automatic United Kingdom, Bishop's Stortford
Rolex GMT-Master PCG Gilt Underline Dial Stainless Steel 1675...
£24,999
Verified Dealer
288
UK
Breitling A45340241B1X4 New Steel 40mm Automatic
Breitling PREMIER AUTOMATIC DAY & DATE 40
£2,342
Verified Dealer
267
IT
Rolex Oyster Perpetual Lady Date 69160 Very good Steel 26mm Automatic
Rolex Oyster perpetual Lady Date
£2,456
Verified Dealer
1317
NL
Omega Speedmaster Professional Moonwatch Moonphase 30433445203001 Very good Steel 44.2mm Automatic United Kingdom, London
Omega 30433445203001 Speedmaster Moonphase - Master Chronomete...
£5,975
Free shipping
Verified Dealer
119
UK
Omega Seamaster DeVille 166033. A Very good Yellow gold 34.5mm Automatic United Kingdom, London
Omega Seamaster De Ville, Cal.565, 18ct, Gold Dial, 1968
£3,150
Free shipping
Verified Dealer
12
UK
Rolex Explorer II 16570 Very good Steel 42mm Automatic
Rolex Explorer II no Hole Stahl Automatik 40mm Ref.16570...
£6,877
Verified Dealer
1268
DE
Breitling Emergency K56121.1 Very good Yellow gold Quartz United Kingdom, Wilmslow
Breitling Emergency K56121.1 Yellow Gold - Box & Papers 2004
£16,615
Verified Dealer
262
UK
Rolex Submariner Date 16613LN Very good Gold/Steel 40mm Automatic United Kingdom, Manchester
Rolex Submariner Date 16613LN 2009 Transitional Model
£8,700
Free shipping
Verified Dealer
40
UK
Rolex Daytona 16520 Unworn Steel 40mm Automatic United Kingdom, London
Rolex Daytona 16520
£29,500
Free shipping
Verified Dealer
472
UK
Rolex Explorer 1016 Fair Steel 36mm Automatic United Kingdom, Bishop's Stortford
Rolex Explorer I Stainless Steel 1016 - COM1782
£11,299
Verified Dealer
288
UK
Breitling Navitimer 1 B01 Chronograph 43 AB0121211C1P3 New Steel 43mm Automatic
Breitling Navitimer 1
£4,646
Verified Dealer
267
IT
Omega Constellation 168.005 Good Steel 33.5mm Automatic United Kingdom, North Ayrshire
TOP
Omega Vintage Constellation
£1,400
Private Seller
 
UK
Panerai Luminor Marina Automatic PAM 104 Steel 44mm Automatic United Kingdom, London
Panerai PAM 104 Luminor Marina Rugby Winners - Europeans...
£6,950
Free shipping
Verified Dealer
119
UK
Jaeger-LeCoultre Very good Yellow gold 34mm Automatic United Kingdom, London
Jaeger-LeCoultre Cal.882 Automatic 9ct, 1969
£3,000
Free shipping
Verified Dealer
12
UK
TAG Heuer Grand Carrera CAV518B.FT6016 Unworn Titanium 43mm Automatic United Kingdom, London
TAG Heuer GRAND CARRERA AUTOMATIC CHRONOGRAPH 43 MM CAV518B.F...
£4,913
Verified Dealer
29
UK
Rolex Day-Date 40 228238-0005 Very good Yellow gold 40mm Automatic United Kingdom, Wilmslow
Rolex Day-Date 40 Yellow Gold Champagne Diamond Dial
£26,995
Verified Dealer
262
UK
Rolex Submariner (No Date) 114060 Very good Steel 40mm Automatic United Kingdom, Manchester
Rolex Submariner Non-Date Black Ceramic 114060
£7,750
Free shipping
Verified Dealer
40
UK
Rolex Sky-Dweller 326139 Very good White gold 42mm Automatic United Kingdom, London
Rolex 18k White Gold Black Dial Annual Calendar Sky-Dweller...
£19,500
Free shipping
Verified Dealer
472
UK
Omega Speedmaster Racing 329.33.44.51.04.001 Very good Steel 44.2mm Automatic United Kingdom, Bishop's Stortford
Omega Speedmaster Speedmaster Racing Chronograph Stainless...
£4,999
Verified Dealer
288
UK
Zenith Pilot Type 20 29.2430.679/63.I001 New Bronze 45mm Automatic
Zenith Pilot Type 20 Adventure
£4,814
Verified Dealer
267
IT
Rolex Datejust 126334 New Steel 41mm Automatic
Rolex Datejust 41mm 2019 Black NEW 126334
£8,004
Verified Dealer
225
US
Chopard L.U.C 161926-5001 Rose gold 43mm Manual winding United Kingdom, London
Chopard 161926-5001 L.U.C Quattro - 9 Day Power Reserve
£14,750
Free shipping
Verified Dealer
119
UK
Omega Constellation Very good 35mm Automatic United Kingdom, London
Omega Constellation Cal.354 18ct Pie-Pan Deluxe 1954
£7,500
Free shipping
Verified Dealer
12
UK
Omega Constellation 14393/4 SC1 Very good Yellow gold 34mm Automatic United Kingdom, Boston
TOP
Omega Constellations 1960 Chronometer Soild 18k gold case an...
£3,995
Private Seller
 
UK
Omega Seamaster Diver 300 M 210.30.42.20.01.001 Very good Steel 42mm Automatic United Kingdom, Wilmslow Cheshire
Omega Seamaster Diver 300 M NEW MODEL BLACK Jan 2019
£3,395
Free shipping
Verified Dealer
97
UK
Rolex Pearlmaster 80339 Unworn White gold 29mm Automatic United Kingdom, Manchester
Rolex Pearlmaster 80339 Serviced by Rolex Diamond Dot
£18,500
Free shipping
Verified Dealer
40
UK
Rolex Milgauss 116400 Very good Steel 40mm Automatic United Kingdom, London
Rolex Milgauss 116400
£5,950
Free shipping
Verified Dealer
472
UK
Omega Seamaster 300 233.90.41.21.03.001 Unworn Titanium 41mm Automatic United Kingdom, Bishop's Stortford
Omega Seamaster 300M Titanium 233.90.41.21.03.001 - W5557
£4,699
Verified Dealer
288
UK
Breitling Avenger Hurricane XB0170E4/I533/257S Unworn 50mm Automatic
Breitling AVENGER HURRICANE 12H
£4,943
Verified Dealer
267
IT
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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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