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Ball NM9030B-S1C-BE New Steel 40mm Automatic
TOP
Ball NM9030B-S1C-BE Roadmaster M Icebreaker LIMITED EDITION...
£1,407
Professional dealer
325
US
Bremont Jaguar MKII White New Steel 43mm Automatic
TOP
Bremont MKII WHITE Dial Jaguar Automatic Chronometer Blue...
£4,928
Professional dealer
325
US
Bremont Supermarine S300/BL/BR New Steel 40mm Automatic
TOP
Bremont Supermarine S300/BL/BR Men's Automatic Blue Dial...
£3,162
Professional dealer
325
US
Bremont Supermarine S300/WHITE/BR New Steel 40mm Automatic
TOP
Bremont Supermarine S300/WHITE/BR Stainless Steel Automatic...
£3,162
Professional dealer
325
US
Omega Constellation 168.005 Fair Gold/Steel 34.0mm Automatic
TOP
Omega Constellation Cal. 564
£1,204
Free shipping
Professional dealer
 
US
Bremont Bremont RFU 150 New Steel 43mm Automatic
TOP
Bremont RFU 150 Men's LIMITED EDITION Blue Dial Automatic...
£3,677
Professional dealer
325
US
Rolex Explorer II 16570 Very good Steel 40mm Automatic United Kingdom, London
TOP
Rolex Explorer II Black Steel 16570
£6,950
Free shipping
Professional dealer
744
UK
Omega Constellation Constellation Manhattan Very good Steel 35mm Automatic
TOP
Omega Constellation Manhattan Vintage 1985 Auto Chronometer...
£1,395
Professional dealer
56
US
Rolex GMT-Master II 126710BLNR Very good Steel 40mm Automatic United Kingdom, London
Rolex 126710BLNR GMT-Master II Batman Jubilee - 4 Year Rolex...
£14,750
Free shipping
Professional dealer
227
UK
Rolex Submariner Date 126610LN Unworn Steel 41mm Automatic United Kingdom, London
TOP
Rolex Submariner Date 41mm Factory Stickers UK Supplied
£12,650
Professional dealer
63
UK
Rolex 116688-0002 New Yellow gold 44mm Automatic United Kingdom, LONDON
Rolex Yacht-master II 42mm Unworn Full Set 2020
£35,250
Professional dealer
29
UK
Rolex Datejust 126334 Unworn Steel 41mm Automatic United Kingdom, London
Rolex Datejust 41 Factory Diamond Dial
£11,500
Professional dealer
14
UK
Audemars Piguet Royal Oak Offshore Chronograph 26400SO.OO.A002CA.01 Unworn Steel 46mm Automatic
TOP
Audemars Piguet AP Royal Oak Offshore 44mm Stahl White Winter...
£23,044
Professional dealer
205
DE
Rolex Submariner Date 126610LN New Steel 41mm Automatic United Kingdom, London
Rolex Submariner Date 41mm 126610LN 2021
£11,299
Professional dealer
 
UK
Rolex Datejust 126334 New Steel 41mm Automatic United Kingdom, Edinburgh
Rolex Datejust 41 Blue Dial - NEW 2020 - New Style Card
£9,700
Professional dealer
66
UK
Rolex GMT-Master II 16710 Very good Steel 40mm Automatic United Kingdom, London
Rolex GMT-Master II Coke Steel 16710
£9,950
Free shipping
Professional dealer
744
UK
Omega Globemaster 130.53.39.21.02.001 Very good Rose gold Automatic United Kingdom, London
Omega Globemaster 18KT Sedna Rose Gold 130.53.39.21.02.001
£8,795
Free shipping
Professional dealer
324
UK
Rolex Day-Date 36 128239 White gold 36mm Automatic United Kingdom, London
Rolex 128239 Day-Date 36 White Gold - Rolex Warranty to 2025
£29,950
Free shipping
Professional dealer
227
UK
Tudor Black Bay 79230R-0003 Very good Steel 41mm Automatic United Kingdom, Sheffield
TOP
Tudor Black Bay Red bezel Ref. 79230-R - Full set/Warranty
£2,400
Professional dealer
375
UK
Rolex GMT-Master II GMT Automatic United Kingdom, London
Rolex GMT-Master II ‘Batman’
£13,500
Professional dealer
6
UK
Rolex Yacht-Master II 116688-0002 Very good Yellow gold 44mm Automatic United Kingdom, London
Rolex Yacht-Master II
£36,250
Professional dealer
14
UK
Omega Seamaster Planet Ocean 232.30.42.21.01.001 Very good Steel 42mm Automatic United Kingdom, Essex
Omega Seamaster Planet Ocean 232.30.42.21.01.001 with Box and...
£3,595
Free shipping
Professional dealer
442
UK
Audemars Piguet Royal Oak Offshore Chronograph 25770ST.OO.D001IN.02 Very good Steel 40mm Automatic United Kingdom, Newark
TOP
Audemars Piguet Royal Oak Offshore Chronograph
£11,750
Private Seller
 
UK
Rolex Sea-Dweller 126600 New Steel 43mm Automatic United Kingdom, Edinburgh
Rolex Sea-Dweller 43 Red - NEW FEB 2021
£12,500
Professional dealer
66
UK
Rolex Daytona 116509 Unworn White gold 40mm Automatic United Kingdom, London
Rolex Daytona White Gold Bright Blue Dial 116509
£34,750
Free shipping
Professional dealer
744
UK
Omega Seamaster Aqua Terra 231.12.42.21.01.002 Very good Steel 41.5mm Automatic United Kingdom, St Albans
Omega Seamaster Aqua Terra Co-axial - Box & Papers 2017
£3,250
Professional dealer
47
UK
Rolex Daytona 116520 Steel 40mm Automatic United Kingdom, London
Rolex 116520 Cosmograph Daytona Chromalight APH - New Old Stock
£25,750
Free shipping
Professional dealer
227
UK
Omega Seamaster Planet Ocean 522.32.40.20.01.003 Unworn Steel 39.5mm Automatic United Kingdom, Sheffield
TOP
Omega Seamaster Olympic Games Collection - Limited Edition...
£3,850
Professional dealer
375
UK
Omega Seamaster Aqua Terra 220.10.41.21.03.004 New Steel 41mm Automatic
TOP
Omega Seamaster Aqua Terra 150M Blue
£4,258
Professional dealer
370
DE
Rolex Datejust 126334 Very good Steel 41mm Automatic United Kingdom, London
Rolex Datejust
£9,650
Professional dealer
14
UK
Rolex Sea-Dweller 126600 Very good Steel 43mm Automatic United Kingdom, Essex
Rolex Sea-Dweller 43 126600 with Box and Papers
£11,295
Free shipping
Professional dealer
442
UK
Omega Speedmaster 310.20.42.50.01.001 Unworn Steel 42mm Automatic United Kingdom, England
TOP
Omega Apollo 11 50th Anniversary Limited Edition Speedmaster
£9,705
Private Seller
 
UK
Tudor Black Bay 79230G New Steel 41mm Automatic United Kingdom, Manchester
Tudor Black Bay 79230G Harrods August 2020 Unworn Special Edition
£4,450
Free shipping
Professional dealer
160
UK
Rolex GMT-Master Rolex GMT-Master 16750 Very good Steel 40mm Automatic United Kingdom, London
Rolex Steel GMT-Master Pepsi 16750
£16,950
Free shipping
Professional dealer
744
UK
Ulysse Nardin Marine Chronometer Manufacture 1183-126/61 Unworn Steel 43mm Automatic United Kingdom, London
TOP
Ulysse Nardin Marine Chronometer Manufacture 1183-126/61 2020,...
£4,900
Professional dealer
415
UK
Audemars Piguet Jules Audemars 26153OR.OO.D088CR.01 Rose gold 46mm Manual winding United Kingdom, London
Audemars Piguet 26153OR.OO.D088CR.01 Jules Audemars Rare...
£79,500
Free shipping
Professional dealer
227
UK
Rolex Submariner Date 126610LN New Steel 41mm Automatic United Kingdom, Edinburgh
Rolex Submariner Date - NEW MODEL - OCTOBER 2020
£12,250
Professional dealer
66
UK
Rolex Datejust 126334 Unworn Steel 41mm Automatic United Kingdom, St Albans
Rolex Datejust 41 - 2020 Unworn - New Style Card
£9,350
Professional dealer
47
UK
Rolex Datejust 126334 Very good Gold/Steel 41mm Automatic United Kingdom, London
Rolex Datejust
£9,400
Professional dealer
14
UK
Rolex Sea-Dweller 126600 New Steel 43mm Automatic
TOP
Rolex Sea-Dweller red new card 2020
£12,137
Professional dealer
43
DE
Breitling Superocean Heritage 46 A1732016/C734/152A Good Steel 46mm Automatic United Kingdom, Eyemouth
TOP
Breitling Superocean Héritage 46
£2,500
Private Seller
 
UK
Chopard Mille Miglia 168997-3001 Very good Steel 44mm Automatic United Kingdom, Manchester
Chopard Mille Miglia Gran Turismo XL JUST SERVICED
£3,150
Free shipping
Professional dealer
160
UK
Rolex Submariner Date 1680 Very good Steel 40mm Automatic United Kingdom, London
Rolex Rare Submariner Date Red Writing Mark VI Vintage Steel 1680
£22,500
Free shipping
Professional dealer
744
UK
Rolex Sea-Dweller 126600 New Steel 43mm Automatic United Kingdom, Essex
Rolex Sea-Dweller 43 126600 with Box and Papers
£11,995
Free shipping
Professional dealer
442
UK
Laurent Ferrier FBN916.01 Rose gold 40.5mm Manual winding United Kingdom, London
Laurent Ferrier FBN916.01 Galet Classic Tourbillon - Enamel...
£72,500
Free shipping
Professional dealer
227
UK
Rolex Sea-Dweller 126600 New Steel 43mm Automatic United Kingdom, Edinburgh
Rolex Sea-Dweller 43 Red - NEW DEC 2020
£12,400
Professional dealer
66
UK
Breitling Colt Automatic A1738811/C906-173A Very good Steel 44mm Automatic United Kingdom, St Albans
Breitling Colt Automatic - Box & Papers 2017
£2,350
Professional dealer
47
UK
Rolex Datejust 126334 Unworn Steel 41mm Automatic United Kingdom, London
Rolex Datejust
£9,750
Professional dealer
14
UK
Omega Speedmaster 324.30.38.50.03.001 New Steel 38mm Automatic
TOP
Omega Speedmaster 38 Co‑Axial Chronograph 38 mm
£3,859
Professional dealer
370
DE
Rolex Submariner (No Date) 114060 Unworn Steel 40mm Automatic United Kingdom, Tenby
TOP
Rolex Submariner (No Date)
£9,650
Private Seller
 
UK
Omega Seamaster Diver 300 M 212.30.41.20.01.005 Very good Steel 41mm Automatic United Kingdom, Manchester
Omega Seamaster 212.30.41.20.01.005 James Bond 50th Anniversar...
£4,850
Free shipping
Professional dealer
160
UK
Rolex Datejust Rolex Datejust 16233 Unworn Gold/Steel 36mm Automatic United Kingdom, London
Rolex Steel & Gold Datejust 16233
£8,500
Free shipping
Professional dealer
744
UK
Rolex Day-Date 1803 Big Logo Clasp Very good Yellow gold 36mm Automatic
TOP
Rolex Day Date President Automatic 18K Gold Herrenuhr Big Logo
£11,081
Professional dealer
650
DE
Omega Speedmaster 31020425001001 Steel 42mm Manual winding United Kingdom, London
Omega 31020425001001 Speedmaster Limited Edition Apollo 11 -...
£10,995
Free shipping
Professional dealer
227
UK
Rolex Datejust 126334 New Steel 41mm Automatic United Kingdom, Edinburgh
Rolex Datejust 41 Steel and White Gold - NEW 2020
£9,500
Professional dealer
66
UK
Rolex Datejust 126334 Unworn Steel 41mm Automatic United Kingdom, St Albans
Rolex Datejust 41 - 2020 Unworn - New Style Card
£9,450
Professional dealer
47
UK
Rolex Datejust 126334 Unworn Steel 41mm Automatic United Kingdom, London
Rolex Datejust
£11,500
Professional dealer
14
UK
Breitling Superocean Heritage II Chronographe A13313121B1A1 New Steel 44mm Automatic
TOP
Breitling Superocean Héritage II Chronograph 44 Volcano Schwarz
£4,046
Professional dealer
370
DE
Omega Speedmaster Professional Moonwatch Moonphase 304.33.44.52.01.001 Very good Steel 46mm Automatic United Kingdom, Cambridge
TOP
Omega Speedmaster Professional Moonwatch Moonphase
£5,500
Private Seller
 
UK
Omega Seamaster Aqua Terra 231.90.43.22.04.001 Very good Titanium 43mm Automatic United Kingdom, Stratford Upon Avon
Omega Seamaster Aqua Terra GMT 2020
£5,075
Free shipping
Professional dealer
9
UK
Rolex Submariner Date Rolex Submariner Date 16610 Unworn Steel 40mm Automatic United Kingdom, London
Rolex Steel Submariner Date NOS 16610
£12,950
Free shipping
Professional dealer
744
UK
Rolex Datejust 126334 Very good Steel 41mm Automatic United Kingdom, Essex
Rolex Datejust 41 126334 with Box and Papers
£9,995
Free shipping
Professional dealer
442
UK
Panerai Radiomir Black Seal PAM00292 Ceramic 45mm Manual winding United Kingdom, London
Panerai PAM00292 Radiomir Black Seal - 'Ceramic' Box & Papers
£4,850
Free shipping
Professional dealer
227
UK
Omega Seamaster Planet Ocean 215.92.46.22.03.001 New Ceramic 45.5mm Automatic United Kingdom, Peebles
Omega Seamaster Planet Ocean Co-axial GMT (Big Blue) - NEW 2019
£7,400
Professional dealer
66
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.


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