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Rolex Datejust 126200 Unworn Steel 36mm Automatic
TOP
Rolex Datejust Jubilee LC 100 ungetragen 04/2020
£7,256
Verified Dealer
65
DE
Graham 2AFAS Very good Steel 42mm Automatic
TOP
Graham Aeroflyback Ref. 2AFAS No. 0297
£1,644
Verified Dealer
166
DE
Rolex Datejust II 126334 Unworn Steel 41mm Automatic
TOP
Rolex Datejust II 41MM Steel&White Gold Blue Roman Dial 2020...
£9,644
Verified Dealer
463
BE
Omega Speedmaster 3291.50.00 Very good Titanium 42mm Chronograph
TOP
Omega Speedmaster X-33 Révisée Like New Full Set
£2,241
Verified Dealer
40
FR
Breitling Colt Automatic A1738811/BD44/173A Very good Steel 44mm Automatic United Kingdom, Sheffield
TOP
Breitling Colt Automatic A1738811
£1,837
Verified Dealer
262
UK
Omega Seamaster Planet Ocean 2201.50.00 Very good Steel 42mm Automatic
Omega Seamaster Planet Ocean 42mm
£2,710
Verified Dealer
133
DE
Rolex GMT-Master II 126710BLNR New Steel 40mm Automatic
TOP
Rolex GMT-Master II 126710BLNR Batman New May 2019
£17,912
Verified Dealer
9
MC
Breitling Bentley Motors A25362 Very good Steel 48mm Automatic United Kingdom, Oxford
Breitling Bentley Motors
£3,996
Verified Dealer
11
NL
TAG Heuer Grand Carrera WAV5113.FC6231 Very good Steel 42.5mm Automatic
TAG Heuer Grand Carrera Date GMT Calibre 8
£1,777
Verified Dealer
714
LV
Rolex Pearlmaster 81208 New Yellow gold 34mm Automatic
Rolex Datejust Pearlmaster 34
£18,739
Verified Dealer
52
CH
Breitling for Bentley AB01181A1Q1X1 New Steel 42mm Automatic United Kingdom, London
TOP
Breitling Premier B01 Chronograph 42 Steel Bentley Centenary...
£7,275
Verified Dealer
931
UK
Breitling AB01343A1L1A1 New Steel 42,00mm Automatic United Kingdom, or EU warehouse (see description)
TOP
Breitling Chronomat B01 42 Bentley Stainless Steel Rouleaux
£5,419
Verified Dealer
273
UK
Rolex Sea-Dweller 126600 Very good Steel 43mm Automatic United Kingdom, London
Rolex Sea-Dweller 43 126600 - RED writing 2018 Box and Papers
£11,250
Verified Dealer
 
UK
Omega Speedmaster Professional Moonwatch Moonphase 304.33.44.52.03.001 304.93.44.52.03.001 New Steel Automatic United Kingdom, Wilmslow Cheshire
TOP
Omega Speedmaster Moonphase Moonwatch 304.93.44.52.03.001
£6,680
Free shipping
Verified Dealer
114
UK
Certina DS-8 C033.457.16.081.00 New Steel 40mm Quartz United Kingdom, Rugeley
Certina C033.457.16.081.00 DS-8 Moon Phase Wristwatch
£363
Verified Dealer
8
UK
Rolex Submariner Date 16610 Very good Steel 40mm Automatic
TOP
Rolex Submariner 16610 military NATO 1994 S series
£32,149
Verified Dealer
9
MC
Omega Seamaster Planet Ocean 232.32.46.21.01.003 Very good Steel 45.5mm Automatic United Kingdom, Oxford
Omega Seamaster Planet Ocean XL
£3,353
Verified Dealer
11
NL
Omega Seamaster 300 233.32.41.21.01.001 Very good Steel 41mm Automatic United Kingdom, Wilmslow
Omega Seamaster 300M Spectre - Box & Papers 2015
£8,330
Verified Dealer
343
UK
Rolex GMT-Master II 16710 Very good Steel 40mm Automatic United Kingdom, London
Rolex 16710 GMT-Master II Coke - Box & Certificate
£12,950
Free shipping
Verified Dealer
188
UK
Omega Constellation 368.1201 Unworn Steel 36mm Automatic United Kingdom, BANGOR ,  CO.DOWN , Northern Ireland
TOP
Omega Constellation Automatic Stainless Steel Watch 36mm
£1,999
Verified Dealer
49
UK
Breitling Chronomat 41 AB014012/Q583 New Steel 41,00mm Automatic United Kingdom, or EU warehouse (see description)
TOP
Breitling Chronomat 41 Automatic Steel Brown Leather
£4,271
Verified Dealer
273
UK
Rolex Lady-Datejust 178344 Very good Gold/Steel 31mm Automatic United Kingdom, Swansea
Rolex Lady-Datejust Jubilee Diamond Dial
£8,100
Verified Dealer
22
UK
Omega Seamaster Diver 300 M 210.20.42.20.01.002 New Gold/Steel 42mm Automatic United Kingdom, Wilmslow Cheshire
TOP
Omega DIVER 300M OMEGA CO‑AXIAL MASTER CHRONOMETER 42 MM
£6,560
Free shipping
Verified Dealer
114
UK
Certina DS-8 C033.051.11.118.01 New 27.5mm Quartz United Kingdom, Rugeley
Certina C033.051.11.118.01 DS-8 Lady Silver Tone Wristwatch
£331
Verified Dealer
8
UK
Rolex GMT-Master II 116710BLNR New Steel 40mm Automatic
TOP
Rolex GMT-Master II 116710BLNR Batman Dec 2018 New
£15,156
Verified Dealer
9
MC
Omega Speedmaster Broad Arrow 321.53.42.50.01.001 Very good Rose gold 42mm Automatic United Kingdom, Oxford
Omega Speedmaster Broad Arrow 1957 Co-Axial Chronograph
£9,415
Verified Dealer
11
NL
Omega Seamaster Planet Ocean 215.32.44.21.01.001 Unworn Steel 43.5mm Automatic United Kingdom, Wilmslow
Omega Seamaster Planet Ocean - Unworn B&P UK Supplied March 2020
£4,650
Verified Dealer
343
UK
Rolex GMT-Master II 116710LN Very good Steel 40mm Automatic United Kingdom, London
Rolex GMT-Master II 116710LN
£8,500
Free shipping
Verified Dealer
604
UK
Ball Engineer Hydrocarbon CM2198C-S1CJ-SL New Steel 42mm Automatic
Ball CM2198C-S1CJ-SL Engineer Hydrocarbon Racer Chrono Watch
£2,372
Free shipping
Verified Dealer
 
US
Omega Constellation 1202.30.00 Very good Gold/Steel 35mm Automatic United Kingdom, HAYES
Omega Constellation 35mm Gold/Steel
£1,700
Verified Dealer
38
UK
Breitling Superocean Héritage II 46 AB202012.BF74.152A Very good Steel 46mm Automatic United Kingdom, Swansea
Breitling Superocean Héritage Ii
£3,145
Verified Dealer
22
UK
Rolex Datejust 126334 Very good Steel 41mm Automatic United Kingdom, Whitby- North Yorkshire
Rolex Datejust 41- Blue Baton Dial- 2019 Box & Papers- Near...
£8,599
Verified Dealer
145
UK
Certina DS-8 C033.451.16.051.00 New Steel 40mm Quartz United Kingdom, Rugeley
Certina C033.451.16.051.00 DS-8 Black Dial Chronometer Wristwatch
£335
Verified Dealer
8
UK
Rolex Sea-Dweller Deepsea 116660 D New Steel 44mm Automatic
TOP
Rolex Deep Sea 116660 D-Blue NOS
£13,686
Verified Dealer
9
MC
Rolex Sea-Dweller 4000 16600 Very good Steel 40mm Automatic United Kingdom, Manchester
Rolex Sea-Dweller 4000 16600 Box & Papers Vintage
£7,750
Verified Dealer
101
UK
Rolex Datejust 126334 Unworn Steel 41mm Automatic United Kingdom, Wilmslow
Rolex Datejust 41mm 126334 Blue Dial Unworn Box & Papers 2020
£9,790
Verified Dealer
343
UK
Rolex GMT-Master II 116710LN Very good Steel 40mm Automatic United Kingdom, London
Rolex GMT-Master II 116710LN
£8,500
Free shipping
Verified Dealer
604
UK
TAG Heuer Grand Carrera WAV5111.BA0901 Good Steel Automatic United Kingdom, WARRINGTON
TOP
TAG Heuer Grand Carrera Wav5111
£1,590
Verified Dealer
36
UK
Omega Speedmaster Professional Moonwatch 310.20.42.50.01.001 New Steel Manual winding United Kingdom, London
Omega Apollo 11 50th NEW Stickered Anniversary Speedmaster...
£9,275
Verified Dealer
196
UK
Omega Seamaster Aqua Terra 220.10.41.21.06.001 Very good Steel 41mm Automatic United Kingdom, Swansea
Omega Seamaster Aqua Terra
£3,599
Verified Dealer
22
UK
Rolex Cellini Dual Time 50529 Very good White gold 39mm Automatic United Kingdom, Macclesfield
Rolex Cellini Dual-Time
£12,480
Verified Dealer
6
UK
Laurent Ferrier FBN916.01 Very good Rose gold 40.5mm Manual winding United Kingdom, London
Laurent Ferrier FBN916.01 Galet Classic Tourbillon - Enamel...
£74,500
Free shipping
Verified Dealer
188
UK
Rolex Submariner Date 116610LV New Steel 40mm Automatic
TOP
Rolex Submariner 116610LV Hulk new sticked
£15,156
Verified Dealer
9
MC
Panerai Luminor Marina Automatic PAM00104 Unworn Steel 44mm Automatic United Kingdom, London
Panerai PAM00104 Luminor Marina full set
£5,600
Verified Dealer
58
UK
Breitling Super Avenger II A13371 Very good Steel 48mm Automatic United Kingdom, Wilmslow
Breitling Super Avenger II - Box & Papers 2017
£3,635
Verified Dealer
343
UK
Rolex Sea-Dweller Deepsea 116660 Very good Steel 44mm Automatic United Kingdom, London
Rolex Deepsea Sea-Dweller 116660
£8,250
Free shipping
Verified Dealer
604
UK
Omega Seamaster Planet Ocean Chronograph 215.30.46.51.01.002 Very good Steel 45.5mm Automatic United Kingdom, Oxford
Omega Seamaster Planet Ocean Chronograph
£4,914
Verified Dealer
NL
Tudor Black Bay 79230G Unworn Steel 41mm Automatic United Kingdom, Manchester
Tudor Black Bay 79230G Harrods 2020 Unworn Special Edition
£4,650
Verified Dealer
101
UK
Breitling Colt Quartz A7438811|G792|173A Very good Steel 44mm Quartz United Kingdom, Swansea
Breitling Colt Quartz
£1,645
Verified Dealer
22
UK
Rolex Datejust 126334 New Steel 41mm Automatic United Kingdom, London
Rolex Datejust Rhodium Dial Jubilee New Grey Dial 41mm Fluted...
£9,600
Verified Dealer
196
UK
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic United Kingdom, Upminster
TOP
Rolex Sea-Dweller 126600 MK1 Red Write Full Stickers NOS 2018
£12,000
Private Seller
 
UK
Rolex Daytona 116520 K Very good Steel 40mm Automatic
TOP
Rolex Daytona 116520 K Séries 2001 cream
£23,790
Verified Dealer
9
MC
Rolex GMT-Master II 16710 Steel 40mm Automatic United Kingdom, London
Rolex 16710 GMT-Master II 'Rectangular' - Box & Papers
£14,950
Free shipping
Verified Dealer
188
UK
Rolex Submariner Date 116610LN Unworn Steel 40mm Automatic United Kingdom, Wilmslow
Rolex Submariner Date 116610LN Unworn Box & Papers 2019
£10,830
Verified Dealer
343
UK
Rolex GMT-Master II 116710BLNR Unworn Steel 40mm Automatic United Kingdom, London
Rolex GMT-Master II Batman 116710BLNR
£11,750
Free shipping
Verified Dealer
604
UK
Omega Speedmaster Professional Moonwatch 311.92.44.30.01.001 Unworn Ceramic 44.25mm Manual winding United Kingdom
Omega Speedmaster Moonwatch "Dark Side of the Moon" Apollo 8
£7,155
Free shipping
Verified Dealer
1544
UK
Rolex Daytona 116520 New Steel 40mm Automatic United Kingdom, Manchester
Rolex Daytona 116520 NOS Stickered White Dial 2008
£23,000
Verified Dealer
101
UK
Breitling Navitimer World A24322 Very good Steel 46mm Automatic United Kingdom, Swansea
Breitling Navitimer World
£3,910
Verified Dealer
22
UK
TAG Heuer Autavia WBE5190.FC8268 New Bronze 42mm Automatic
TOP
TAG Heuer Autavia Calibre 5 Chronometer Bronze
£2,751
Verified Dealer
291
DE
Omega Constellation 168.5415 Very good Yellow gold 34.0mm Automatic United Kingdom, North Ayrshire
TOP
Omega Vintage 1962 18CT gold Omega Constellation
£5,700
Private Seller
 
UK
Omega Seamaster 300 233.20.41.21.01.001 Very good Rose gold Automatic United Kingdom, London
Omega Seamaster 300 CoAxial 18KT Rose Sedna Gold
£4,995
Verified Dealer
277
UK
Rolex Milgauss 116400GV Steel 40mm Automatic United Kingdom, London
Rolex 116400GV Milgauss 'Z-Blue' -
£8,750
Free shipping
Verified Dealer
188
UK
Rolex Daytona 116523 Very good Gold/Steel 40mm Automatic United Kingdom, Wilmslow
Rolex Daytona 16523 Box & Papers 1998 Serviced by Rolex in 2020
£13,540
Verified Dealer
343
UK
Rolex Sea-Dweller 4000 16600 Very good Steel 40mm Automatic United Kingdom, London
Rolex Sea-Dweller 16600
£7,950
Free shipping
Verified Dealer
604
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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