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41,023 listings including promoted listings
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Promoted
Rolex Datejust 41
126334
£12,531
+ £87 for shipping
Chrono24 Direct
Promoted
Rolex Daytona
ref. 6239 year 1969 - Big Daytona Dial - 100% Original From Period - 100% Intact
£48,198
+ £122 for shipping
Promoted
Rolex Datejust 41
Black Oyster - 2023 - 126334
£11,150
+ £43 for shipping
Popular
Rolex Datejust 41
126334 'Mint Green' - 2023 Box & Papers
£11,700
+ £20 for shipping
Promoted
Rolex GMT-Master II
2023 GMT-Master II Sprite Left Hander Unworn Box Papers 126720VTNR
£16,950
Free shipping
Promoted
Rolex Submariner (No Date)
2024 41mm Submariner No Date Unworn Box And Papers 124060
£10,850
Free shipping
Rolex GMT-Master II
"Sprite" Jubilee 2022 Box & Papers
£16,500
+ £43 for shipping
Rolex Datejust 41
126334
£12,250
+ £43 for shipping
Popular
Rolex Datejust 41
Mint Green Dial - 126334 - 2023
£11,700
+ £43 for shipping
Rolex Submariner Date
2023 | Unworn | Full Set
£11,750
+ £43 for shipping
Rolex Submariner Date
41mm Full Set
£11,745
Free shipping
Popular
Omega Seamaster Diver 300 M
210.30.42.20.01.001
£3,995
Free shipping
Rolex GMT-Master II
126720VTNR
£17,000
+ £150 for shipping
Promoted
Rolex Datejust 41
Blue Roman Dial 2023 Unworn Box And Papers 126334
£10,950
Free shipping
Promoted
Rolex Datejust 41
Mint Green Baton Dial Steel And White Gold 126334 Box And Papers 2023
£12,250
Free shipping
Rolex Submariner (No Date)
Non-Date (2023 Box & Papers)
£11,295
+ £43 for shipping
Rolex Submariner Date
126610LN
£11,950
+ £43 for shipping
Rolex Datejust 41
Blue - 2023 - 126334
£12,500
+ £43 for shipping
Popular
Tudor Black Bay
58 925 39mm Taupe Dial Model 79010SG 2023 Box & Papers
£3,149
Free shipping
Rolex Datejust 41
Wimbledon Dial
£10,695
Free shipping
Rolex Submariner (No Date)
124060
£11,250
+ £200 for shipping
Promoted
Rolex Datejust 41
Rhodium Dial Ref: 126334 – Full Set – 2017
£9,000
+ £30 for shipping
Promoted
Rolex Datejust 41
2023 Datejust 41 Wimbledon Dial 126334 Unworn Jubilee Bracelet Box And Papers
£12,350
Free shipping
Promoted
Rolex Submariner (No Date)
Stainless Steel 124060 - W010991
£10,250
Free shipping
Chrono24 Direct
Rolex Submariner Date
2021 Box & papers
£11,545
+ £43 for shipping
Rolex Datejust 41
126334
£12,250
+ £43 for shipping
Popular
Rolex Submariner Date
126610ln - 2023
£11,350
+ £43 for shipping
Popular
Omega Seamaster Planet Ocean
600M Summer Edition Diver Blue 2023 Bracelet
£5,891
+ £161 for shipping
Rolex Datejust 41
Blue Batton Jubilee Fluted 2023
£10,995
Free shipping
Rolex GMT-Master II
Sprite
£16,750
+ £200 for shipping

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Promoted
Omega De Ville Prestige
4574.3100 36.5mm Case
£2,395
Free shipping
Promoted
Rolex Datejust 41
Mint Green Dial Fluted Bezel Oyster Bracelet 2023 126334 Box & Papers
£11,950
Free shipping
Rolex Sea-Dweller
43mm Black Dial 126600
£10,780
+ £133 for shipping
Rolex Datejust 41
Azzurro Roman (2021 Full Set)
£9,450
+ £43 for shipping
Rolex Datejust 41
126334
£10,395
+ £30 for shipping
Rolex Datejust 41
Blue - 2022 - 126334
£10,900
+ £43 for shipping
Popular
Omega Speedmaster Professional Moonwatch
310.32.42.50.01.001 Hesalite 42mm
£4,143
+ £80 for shipping
Rolex Datejust 41
Fluted bezel Black dial
£10,450
Free shipping
Promoted
Rolex Datejust 41
2023 Steel Datejust 41 Black Dial 126334 Partial Stickers Unworn Box And Papers
£10,650
Free shipping
Popular
Breitling Navitimer World
GMT Auto 46mm Black Dial 2014 Box & Papers
£3,749
Free shipping
Promoted
Rolex Sea-Dweller
Red Writing 43mm Unworn 2023 Box & Papers 126600
£11,850
Free shipping
Omega Speedmaster Professional Moonwatch
3861 Hesalite 310.30.42.50.01.001
£4,599
+ £133 for shipping
Popular
Omega Seamaster Diver 300 M
2551.80.00
£1,500
Excl. shipping
Private Seller
Rolex Sea-Dweller
126600 SD43 Red mk2
£10,995
+ £45 for shipping
Rolex GMT-Master II
126720VTNR
£15,495
+ £30 for shipping
Omega Speedmaster
Professional Moonwatch Moonphase 2022 304.33.44.52.03.001 August 2022
£7,500
+ £43 for shipping
Rolex Datejust 41
Blue Diamond Dot Dial 2023
£12,245
Free shipping
Rolex Sea-Dweller
126600
£10,000
Free shipping
Promoted
Longines Spirit
L3.810.4.53.6
£1,377
Excl. shipping
Private Seller
Popular
Rolex Datejust 41
2023 Datejust 41 Blue Baton Dial 126334 Unworn Jubilee Bracelet Box And Papers
£11,950
Free shipping
Rolex Submariner Date
UNWORN - 2023
£11,250
+ £87 for shipping
Rolex Submariner (No Date)
Non Date 124060 (2020) Automatic Watch
£9,650
Free shipping
Rolex Sea-Dweller
43mm Black Dial 126600
£10,780
+ £133 for shipping
Promoted
Omega Seamaster Aqua Terra
Stainless Steel 220.10.43.22.03.001 - W010971
£6,450
Free shipping
Chrono24 Direct
Tudor Pelagos
FXD Marine Nationale MN21 42mm – Model 25707B/21 2021 Box & Papers
£4,999
Free shipping
Rolex GMT-Master II
126720VTNR
£16,495
Free shipping
Rolex Submariner (No Date)
124060
£10,500
+ £43 for shipping
Popular
Omega Seamaster 300
Co-Axial Master Chronometer
£4,995
Free shipping
Promoted
Rolex GMT-Master II
2023 GMT-Master II Sprite Oyster Bracelet Unworn Box Papers 126720VTNR
£15,950
Free shipping
Omega Seamaster Planet Ocean
2200.51 Steel 2007 Black dial
£2,750
+ £43 for shipping
Popular
Omega Seamaster Diver 300 M
42mm (2022) - Blue Ceramic Bezel Co-Axial Automatic Watch
£3,950
Free shipping
Tudor Black Bay Chrono
41mm White 79360N
£3,630
+ £133 for shipping
Popular
Rolex Day-Date 36
White Gold Top Conditions
£14,455
Free shipping

Performance of a Similar Model

Rolex Datejust 41
126334 ()
Case material
Steel
Dial
Green

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.