Over 400,000 watches covered by Chrono24 Buyer Protection

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Frederique Constant Vintage Rally FC-392HSDG6B6 Very good Steel 43mm Automatic United Kingdom, London
TOP
Frederique Constant Vintage Rally Healey Watch and Box Only
£1,495
Free shipping
Professional dealer
4.90 (163)
UK
Omega Seamaster Planet Ocean 2909.50.38 Very good Steel 42mm Automatic
TOP
Omega Seamaster Planet Ocean 42mm Orange + Extra Strap...
£3,221
Free shipping
Professional dealer
4.89 (220)
NL
Breitling Superocean 42 A17366D81C1A1 New Steel 42mm Automatic
TOP
Breitling Superocean Automatic 42mm Blue
£2,576
+ £87 for shipping
Professional dealer
4.84 (1,197)
DE
Rolex Explorer II 16570T Very good Steel 40mm Automatic
TOP
Rolex Explorer II 16570T No holes Polar Dial Extra Full Set...
£10,025
+ £436 for shipping
Professional dealer
4.79 (12)
FR
Chopard Mille Miglia 8920 Very good Steel 40.5mm Automatic
TOP
Chopard Mille Miglia Chronograph Automatik Edelstahl Herrenuhr...
£2,572
+ £78 for shipping
Sold by Chrono24
DE
Rolex Submariner Date 116610LN Very good Steel 40mm Automatic United Kingdom, London
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Rolex 116610LN Submariner Date 40 - Discontinued
£12,750
Free shipping
Professional dealer
4.91 (201)
UK
Chopard Grand Prix de Monaco Historique 168569-3001 New Titanium 44.5mm Automatic
TOP
Chopard NEW Grand Prix de Monaco Historique
£3,242
+ £123 for shipping
Professional dealer
4.85 (199)
US
Omega Constellation Ladies 123.20.35.20.02.005 Unworn Gold/Steel 35mm Automatic United Kingdom, WARRINGTON
TOP
Omega Constellation 18K Red Gold 123.20.35.20.02.005 2018...
£3,995
Free shipping
Professional dealer
4.90 (65)
UK
Rolex Sea-Dweller 126600 Very good Steel 43mm Automatic United Kingdom, Bishop's Stortford
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Rolex Sea-Dweller 50th anniversary Stainless Steel 126600 -...
£11,849
Free shipping
Professional dealer
4.89 (274)
UK
Omega Seamaster Diver 300 M 2551.80.00 Good Steel 36mm Automatic United Kingdom, Hants
Omega Seamaster
£1,795
+ £13 for shipping
Professional dealer
4.88 (11)
UK
Rolex Yacht-Master 37 268655 Very good Rose gold 37mm Automatic United Kingdom, London
Rolex Yacht-Master 37 Oysterflex Rose Gold 268655
£17,500
Free shipping
Professional dealer
4.83 (546)
UK
Omega Constellation 168.017 Good Steel 34mm Automatic United Kingdom, Ayrshire Scotland
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Omega Vintage 1964 C cased Constellation on Omega bracelet
£1,250
+ £10 for shipping
Professional dealer
4.98 (42)
UK
Breitling Superocean 42 A17366021B1S2 New Steel 42mm Automatic United Kingdom, London, SW3 1NX
TOP
Breitling Superocean Automatic 42 Steel - ref A17366021/B1S2
£2,485
+ £90 for shipping
Professional dealer
4.85 (91)
UK
Chopard Mille Miglia 168565-3001 Very good Steel 43mm Automatic
TOP
Chopard 1000 Miglia Automatik Edelstahl Herrenuhr Ref....
£3,182
+ £78 for shipping
Sold by Chrono24
DE
Breitling AB0118221B1P1 New Steel 42mm Automatic United Kingdom, Edinburgh
Breitling Premier B01 Chronograph 42 - 2021 NEW
£5,000
+ £39 for shipping
Professional dealer
4.99 (89)
UK
Omega Constellation 26 Good Steel 35mm Automatic United Kingdom, London
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Omega Constellation Chronometer Automatic Men’s Vintage Watch...
£1,349
Free shipping
Professional dealer
4.90 (123)
UK
Omega De Ville Prestige 424.10.40.20.02.003 Very good Steel 39.5mm Automatic United Kingdom, WARRINGTON
TOP
Omega Deville Prestige Co-Axial 2500 424.10.40.20.02.003 2019...
£2,399
Free shipping
Professional dealer
4.90 (65)
UK
Omega Seamaster Diver 300 M 2531.80 Very good Steel 41mm Automatic
TOP
Omega Seamaster Automatic 2531.80 James Bond Blue Wave...
£3,007
+ £75 for shipping
Professional dealer
4.86 (46)
US
Rolex Submariner Date 126610LN New Steel 41mm Automatic United Kingdom, Hayling Island
Rolex Submariner Date 41mm 126610LN stainless steel black
£12,453
+ £43 for shipping
Professional dealer
4.95 (66)
UK
Rolex Daytona 116505 Unworn Rose gold 40mm Automatic United Kingdom, London
Rolex Daytona Rose Gold NOS 116505
£43,500
Free shipping
Professional dealer
4.83 (546)
UK
Rolex Datejust 41 126334 New Steel 41mm Automatic United Kingdom, London
Rolex 2020 Datejust 41 Wimbledon Fluted Bezel Jubilee Bracelet
£11,750
+ £43 for shipping
Professional dealer
5.00 (5)
UK
Omega Seamaster Diver 300 M 210.62.44.51.01.001 New Rose gold 44mm Automatic
TOP
Omega Seamaster Diver 44MM Chronograph 750 Rosegold
£20,917
+ £131 for shipping
Professional dealer
4.92 (263)
DE
Omega De Ville Co-Axial 431.13.41.21.01.001 Very good Steel 41mm Automatic
TOP
Omega De Ville Co-Axial Automatik Stahl Herrenuhr 431.13.41.21...
£4,489
+ £139 for shipping
Sold by Chrono24
DE
Omega Speedmaster '57 331.10.42.51.02.002 Unworn Steel 41.5mm Automatic United Kingdom, Edinburgh
Omega Speedmaster '57 Co-Axial Chronograph - NEW OLD STOCK
£5,250
+ £39 for shipping
Professional dealer
4.99 (89)
UK
Omega Seamaster 2537 Very good 36mm Automatic United Kingdom, London
TOP
Omega Seamaster Chronometer Automatic Men’s Vintage Watch...
£1,299
Free shipping
Professional dealer
4.90 (123)
UK
Omega De Ville Prestige 424.10.40.20.02.004 Very good Steel 39.5mm Automatic United Kingdom, WARRINGTON
TOP
Omega Deville Prestige Co-Axial 2500 424.10.40.20.02.004 2018...
£2,399
Free shipping
Professional dealer
4.90 (65)
UK
Rolex Datejust 41 126334 Very good Steel 41mm Automatic United Kingdom, Whitby- North Yorkshire
Rolex Datejust 41- Rhodium Dial- Jubilee Bracelet- 2019 Box &...
£8,999
Free shipping
Professional dealer
4.97 (271)
UK
Rolex Submariner Date 126610LN New Steel 41mm Automatic United Kingdom, Fareham
Rolex Black Dial Submariner Date 41mm - 2021 Card - 126610ln
£12,453
+ £43 for shipping
Professional dealer
4.95 (66)
UK
Rolex Day-Date 36 118238 Very good Yellow gold 36mm Automatic United Kingdom, London
Rolex Day-Date Yellow Gold 118238
£17,950
Free shipping
Professional dealer
4.83 (546)
UK
Rolex Datejust 41 126334 New White gold 41mm Automatic United Kingdom, London
Rolex 2021 Datejust 41 Rhodium Grey Dial 126334 Oyster...
£9,950
+ £43 for shipping
Professional dealer
5.00 (5)
UK

Worry-Free Watch Purchases

Chrono24 Buyer Protection Has You Covered

More information

Rolex Explorer II 16570 Very good Steel 40mm Automatic
TOP
Rolex Explorer II 16570 Stahl Automatik 2000 Zweite Zeitzone...
£6,704
+ £60 for shipping
Professional dealer
4.88 (609)
DE
Omega De Ville Co-Axial 431.13.41.21.01.001 Very good Steel 41mm Automatic
TOP
Omega De Ville Automatik Stahl Herrenuhr Ref. 431.13.41.21.01....
£3,443
+ £78 for shipping
Sold by Chrono24
DE
Breitling Aviator 8 A13316101C1A1 New Steel 43mm Automatic United Kingdom, Edinburgh
Breitling Aviator 8 Chronograph 43 - 2021 NEW
£3,750
+ £39 for shipping
Professional dealer
4.99 (89)
UK
Omega Constellation 27 Very good Steel 35mm Automatic United Kingdom, London
TOP
Omega Constellation Chronometer Vintage Men’s Watch 1968,...
£1,399
Free shipping
Professional dealer
4.90 (123)
UK

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.