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Breitling Aerospace K65062 - Serviced By Breitling
TOP
Breitling Aerospace K65062 - Serviced By Breitling
£9,140
Seller
Mark Worthington Jewellers
74
UK
Rolex Daytona Diamond & Ruby Set 116589SALV
TOP
Rolex Daytona Diamond & Ruby Set 116589SALV
£84,500
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
154
UK
Rolex Sea-Dweller
Rolex Sea-Dweller
£5,650
Seller
A. W. Porter & Son Ltd
 
UK
Breitling Navitimer 01 Limited Edition
Breitling Navitimer 01 Limited Edition
£4,500
Seller
Timespec
 
UK
Omega Seamaster Planet Ocean Winter Olympics PyeongChang 2018
Omega Seamaster Planet Ocean Winter Olympics PyeongChang 2018
£4,950
Seller
Chronos Aeon Ltd
 
UK
Omega De Ville Hour Vision
Omega De Ville Hour Vision
£4,250
Seller
its time for watch
7
UK
TAG Heuer Grand Carrera
TAG Heuer Grand Carrera
£2,500
Seller
Stephen Hughes Limited
 
UK
Omega Seamaster - SMPc - Black
Omega Seamaster - SMPc - Black
£2,341
Seller
Hoboken Watch
 
US
Omega Watch Seamaster 300m 233.32.41.21.01.001
Omega Watch Seamaster 300m 233.32.41.21.01.001
£6,750
Seller
Watchfinder.co.uk Ltd
UK
Omega Speedmaster Dark Side Of The Moon Black Ceramic Men's...
TOP
Omega Speedmaster Dark Side Of The Moon Black Ceramic Men's...
£6,795
Seller
Xupes.com
113
UK
Vacheron Constantin Overseas
Vacheron Constantin Overseas
£7,943
Free shipping
Seller
Swiss Ice
 
US
Rolex Explorer II Steve McQueen 1655
TOP
Rolex Explorer II Steve McQueen 1655
£19,950
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
154
UK
Rolex Yacht-Master
Rolex Yacht-Master
£5,000
Seller
Timespec
 
UK
Breitling Navitimer 18K Yellow Gold 42mm Mens Watch, Full Set
TOP
Breitling Navitimer 18K Yellow Gold 42mm Mens Watch, Full Set
£9,995
Seller
WT Time Pieces
36
UK
Omega Seamaster Aqua Terra Diamonds Rose Gold&Steel
Omega Seamaster Aqua Terra Diamonds Rose Gold&Steel
£3,950
Seller
its time for watch
7
UK
Bulova 63B159
Bulova 63B159
£1,286
Seller
Tick Tock Shop
 
US
Omega Seamaster - SMPc - Blue
Omega Seamaster - SMPc - Blue
£2,341
Seller
Hoboken Watch
 
US
Omega Watch Planet Ocean 2201.50.00
Omega Watch Planet Ocean 2201.50.00
£2,400
Seller
Watchfinder.co.uk Ltd
UK
Rolex Sea-Dweller 126600 50th Anniversary
TOP
Rolex Sea-Dweller 126600 50th Anniversary
£10,500
Seller
JPA Watch Company Ltd
34
UK
Rolex Oyster Perpetual Air King Automatic Mens Watch 114234
Rolex Oyster Perpetual Air King Automatic Mens Watch 114234
£3,404
Free shipping
Seller
CJ Charles Jewelers
 
US
Chopard Grand Prix de Monaco Historique Rose & Titanium
TOP
Chopard Grand Prix de Monaco Historique Rose & Titanium
£4,670
Seller
Watch Center London
638
UK
Rolex Oyster Perpetual Datejust - S&G - Diamond Hours - 36mm
Rolex Oyster Perpetual Datejust - S&G - Diamond Hours - 36mm
£3,995
Seller
Timespec
 
UK
Omega Seamaster 300 "Spectre" Limited Edition 233.32.41.21.01.001
TOP
Omega Seamaster 300 "Spectre" Limited Edition 233.32.41.21.01.001
£8,150
Seller
Regal Time Ltd
13
UK
Rolex Precision Rare Chronometer Vintage 4134
TOP
Rolex Precision Rare Chronometer Vintage 4134
£12,500
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
154
UK
Breitling Superocean Heritage II 46
Breitling Superocean Heritage II 46
£2,651
Seller
Guardian Of Time
529
UK
Rolex Submariner - HULK - 116610LV
Rolex Submariner - HULK - 116610LV
£8,318
Seller
Hoboken Watch
 
US
Omega Watch Seamaster 300m 233.32.41.21.01.001
Omega Watch Seamaster 300m 233.32.41.21.01.001
£7,395
Seller
Watchfinder.co.uk Ltd
UK
Omega Seamaster Planet Ocean 44mm  215.30.44.21.03.001
TOP
Omega Seamaster Planet Ocean 44mm 215.30.44.21.03.001
£3,695
Seller
JPA Watch Company Ltd
34
UK
Breitling For Bentley Chronograph A44362
Breitling For Bentley Chronograph A44362
£4,917
Free shipping
Seller
CJ Charles Jewelers
 
US
Rolex Day-Date Yellow Gold NEW
TOP
Rolex Day-Date Yellow Gold NEW
£12,364
Seller
Watch Center London
638
UK
Rolex Date aus 00/01 Ref: 15200 - Service 06.17
TOP
Rolex Date aus 00/01 Ref: 15200 - Service 06.17
£3,043
Seller
mywatches21
56
DE
Rolex Oyster Perpetual Date Edelstahl Automatic Herrenuhr
TOP
Rolex Oyster Perpetual Date Edelstahl Automatic Herrenuhr
£2,482
Seller
Timeless Watches GmbH
169
DE
TAG Heuer 18k Yellow Gold White Baton Dial Carrera B&P WV5140
TOP
TAG Heuer 18k Yellow Gold White Baton Dial Carrera B&P WV5140
£3,450
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
154
UK
Omega Speedmaster Moonwatch Dark Side of the Moon Black...
Omega Speedmaster Moonwatch Dark Side of the Moon Black...
£6,051
Free shipping
Seller
WatchShopping.com Inc.
14
US
Omega Seamaster 300 - Vintage Look
Omega Seamaster 300 - Vintage Look
£3,249
Seller
Hoboken Watch
 
US
Omega Watch Seamaster Chrono Diver 213.30.42.40.01.001
Omega Watch Seamaster Chrono Diver 213.30.42.40.01.001
£2,910
Seller
Watchfinder.co.uk Ltd
UK
Rolex Deepsea Seadweller 116660 D Blue James Cameron 2016
TOP
Rolex Deepsea Seadweller 116660 D Blue James Cameron 2016
£10,450
Seller
JPA Watch Company Ltd
34
UK
Breitling Bentley Barnato 42MM Stainless Steel A41390
Breitling Bentley Barnato 42MM Stainless Steel A41390
£4,161
Free shipping
Seller
CJ Charles Jewelers
 
US
Rolex Day-Date Cognac Dial Leather Strap, Ref: 118138
TOP
Rolex Day-Date Cognac Dial Leather Strap, Ref: 118138
£10,500
Seller
Tempvs Ltd
93
UK
Breitling Avenger Blackbird 44
Breitling Avenger Blackbird 44
£2,633
Seller
Guardian Of Time
529
UK
Rolex Day-Date, ref: 1803.  Grey dial.  Yellow  Gold. 1967.
Rolex Day-Date, ref: 1803. Grey dial. Yellow Gold. 1967.
£7,995
Seller
Prestige Watches
 
UK
Rolex DATEJUST EDELSTAHL / 18K GOLD GELBGOLD SERVICE 02/2017
TOP
Rolex DATEJUST EDELSTAHL / 18K GOLD GELBGOLD SERVICE 02/2017
£3,371
Seller
Timeless Watches GmbH
169
DE
Omega Speedmaster 38 Co-Axial Chronograph Grey Steel 38mm -...
Omega Speedmaster 38 Co-Axial Chronograph Grey Steel 38mm -...
£2,632
Free shipping
Seller
WatchShopping.com Inc.
14
US
Omega Planet Ocean Blue 600M
Omega Planet Ocean Blue 600M
£3,552
Seller
Hoboken Watch
 
US
Omega Watch Aqua Terra 150m Gents 231.10.39.21.03.002
Omega Watch Aqua Terra 150m Gents 231.10.39.21.03.002
£3,150
Seller
Watchfinder.co.uk Ltd
UK
Omega Speedmaster 125 anniversary model 1973 limited edition
TOP
Omega Speedmaster 125 anniversary model 1973 limited edition
£4,750
Seller
Antique Watch Company
7
UK
Breitling Chronomat GMT AB041012/BA69
Breitling Chronomat GMT AB041012/BA69
£4,161
Free shipping
Seller
CJ Charles Jewelers
 
US
Omega Seamaster Aqua Terra 22012382003001
Omega Seamaster Aqua Terra 22012382003001
£3,064
Seller
East Time LLC
 
US
Breitling Superocean II 44
Breitling Superocean II 44
£2,206
Seller
Guardian Of Time
529
UK
Ulysse Nardin Manufacture 43 Limited 888 266 67
TOP
Ulysse Nardin Manufacture 43 Limited 888 266 67
£9,456
Seller
Noblesse LP
50
UK
Rolex Datejust Medium Midsize 18K Gold Gelbgold Automatic...
TOP
Rolex Datejust Medium Midsize 18K Gold Gelbgold Automatic...
£4,884
Seller
Timeless Watches GmbH
169
DE
Omega Seamaster Diver 300m Black Steel 36.25mm - 212.30.36.20....
Omega Seamaster Diver 300m Black Steel 36.25mm - 212.30.36.20....
£2,004
Free shipping
Seller
WatchShopping.com Inc.
14
US
Omega Seamaster 300 Spectre - 2018 Unworn
Omega Seamaster 300 Spectre - 2018 Unworn
£8,360
Seller
Mark Worthington Jewellers
74
UK
Omega Watch Seamaster Chrono Diver 2594.50.00
Omega Watch Seamaster Chrono Diver 2594.50.00
£2,750
Seller
Watchfinder.co.uk Ltd
UK
Rolex Daytona Rainbow Ref:116598RBOW
Rolex Daytona Rainbow Ref:116598RBOW
£188,139
Seller
Nautilus Watches Ltd
 
UK
Ulysse Nardin GMT +/- Perpetual 18KT White Gold 320-60
Ulysse Nardin GMT +/- Perpetual 18KT White Gold 320-60
£20,047
Free shipping
Seller
CJ Charles Jewelers
 
US
Rolex Day-Date
Rolex Day-Date
Price on request
Seller
Northern Light Gems, Inc.
 
US
Omega Seamaster AQUA TERRA 150 M OMEGA MASTER CO-AXIAL 41.5 MM
Omega Seamaster AQUA TERRA 150 M OMEGA MASTER CO-AXIAL 41.5 MM
£3,158
Seller
Guardian Of Time
529
UK
Ulysse Nardin Maxi Marine Chronometer 43mm
TOP
Ulysse Nardin Maxi Marine Chronometer 43mm
£8,473
Seller
Noblesse LP
50
UK
Rolex OYSTER PERPETUAL DATEJUST EDELSTAHL SERVICE 02.2017
TOP
Rolex OYSTER PERPETUAL DATEJUST EDELSTAHL SERVICE 02.2017
£3,549
Seller
Timeless Watches GmbH
169
DE
Omega Seamaster Aqua Terra 150M  Master Chronometer Blue...
Omega Seamaster Aqua Terra 150M Master Chronometer Blue...
£3,116
Free shipping
Seller
WatchShopping.com Inc.
14
US
Omega Seamaster Planet Ocean 21530442201001
Omega Seamaster Planet Ocean 21530442201001
£4,539
Seller
East Time LLC
 
US
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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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