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Omega De Ville Prestige
TOP
Omega De Ville Prestige
£2,473
Seller
TIME TRADER
26
PL
Omega Seamaster 300 "Spectre"
TOP
Omega Seamaster 300 "Spectre"
£7,373
Seller
KronologY
47
FR
Omega Seamaster Diver 300 M
TOP
Omega Seamaster Diver 300 M
£1,750
Seller
Chase Hattan
24
UK
Breitling for Bentley Motors Chronograph A25362 Special...
TOP
Breitling for Bentley Motors Chronograph A25362 Special...
£3,795
Seller
CHRONO WATCH
94
UK
Hublot King Power F1 India,  Ltd Edition, Box & Papers
TOP
Hublot King Power F1 India, Ltd Edition, Box & Papers
£16,500
Seller
Tempvs Ltd
110
UK
Rolex GMT-Master Vintage UAE Air Force 1675
Rolex GMT-Master Vintage UAE Air Force 1675
£95,000
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
221
UK
Omega Seamaster Diver 300 M Co Axial
TOP
Omega Seamaster Diver 300 M Co Axial
£2,350
Free shipping
Seller
JPA Watch Company Ltd
51
UK
Breitling Superocean 44
Breitling Superocean 44
£2,200
Seller
G.W Blower
 
UK
Breitling Navitimer World
Breitling Navitimer World
£3,350
Seller
Maunder Watch Co
26
UK
Ulysse Nardin Manufacture 43 Limited 888 266 67
TOP
Ulysse Nardin Manufacture 43 Limited 888 266 67
£9,550
Seller
Noblesse LP
103
UK
Rolex Oyster Perpetual Date "Blue"  18K Gold Service 03/2018
TOP
Rolex Oyster Perpetual Date "Blue" 18K Gold Service 03/2018
£4,307
Seller
Timeless Watches GmbH
230
DE
TAG Heuer Watch Grand Carrera CAV5115.BA0902
TAG Heuer Watch Grand Carrera CAV5115.BA0902
£3,750
Seller
Watchfinder.co.uk Ltd
UK
Omega Seamaster Aqua Terra Chronograph 231.20.44.50.06.001
TOP
Omega Seamaster Aqua Terra Chronograph 231.20.44.50.06.001
£4,550
Seller
CHRONO WATCH
94
UK
Breitling Colt Automatic
Breitling Colt Automatic
£1,985
Seller
Lumbers Jewellers
12
UK
Rolex Sea-Dweller 16600
Rolex Sea-Dweller 16600
£5,950
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
221
UK
Omega Seamaster DIVER 300 M CO-AXIAL 41 MM
Omega Seamaster DIVER 300 M CO-AXIAL 41 MM
£2,293
Seller
Guardian Of Time
751
UK
Breitling NAVITIMER 8 AUTOMATIC 41 A17314101B1X1
Breitling NAVITIMER 8 AUTOMATIC 41 A17314101B1X1
£2,284
Seller
Your Luxury Time LTD
302
UK
Omega Seamaster Diver 300 M
Omega Seamaster Diver 300 M
£2,100
Seller
Maunder Watch Co
26
UK
Omega Seamaster Planet Ocean Chrono 2210.50.00
Omega Seamaster Planet Ocean Chrono 2210.50.00
£3,150
Seller
Parkers Jewellers Limited
6
UK
Rolex Datejust II Diamond Sundust Dial Jubilee Rose Gold
Rolex Datejust II Diamond Sundust Dial Jubilee Rose Gold
£9,625
Seller
Ahead Of Time Sunny Isles LLC
9
US
Omega Watch Planet Ocean 232.30.38.20.01.001
Omega Watch Planet Ocean 232.30.38.20.01.001
£2,910
Seller
Watchfinder.co.uk Ltd
UK
Rolex Date Just 41 (Wimbledon Dial)
TOP
Rolex Date Just 41 (Wimbledon Dial)
£8,959
Seller
Private Seller
 
UK
Breitling Galactic 32
Breitling Galactic 32
£3,200
Seller
Lumbers Jewellers
12
UK
Rolex S/Steel Unworn Black Dial Sea-Dweller NOS Gents B&P 16600
Rolex S/Steel Unworn Black Dial Sea-Dweller NOS Gents B&P 16600
£9,250
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
221
UK
Rolex Datejust
Rolex Datejust
£7,014
Seller
Guardian Of Time
751
UK
Breitling Avenger Blackbird 44  V1731110/BD74/109W/M20BASA.1
Breitling Avenger Blackbird 44 V1731110/BD74/109W/M20BASA.1
£2,653
Seller
Your Luxury Time LTD
302
UK
Omega Speedmaster Professional Moonwatch
Omega Speedmaster Professional Moonwatch
£7,600
Seller
Maunder Watch Co
26
UK
Omega Seamaster Aqua Terra Co-Axial 231.13.44.50.06.001
Omega Seamaster Aqua Terra Co-Axial 231.13.44.50.06.001
£3,350
Seller
Parkers Jewellers Limited
6
UK
TAG Heuer Grand Carrera CAV511A.BA0902
TOP
TAG Heuer Grand Carrera CAV511A.BA0902
£1,795
Seller
The Watch Directory
56
UK
Omega Watch Planet Ocean 2200.51.00
Omega Watch Planet Ocean 2200.51.00
£2,350
Seller
Watchfinder.co.uk Ltd
UK
Breitling Bentley Motors Special Edition
TOP
Breitling Bentley Motors Special Edition
£3,699
Seller
Private Seller
 
UK
Breitling Colt Chronograph Automatic
Breitling Colt Chronograph Automatic
£2,500
Seller
Lumbers Jewellers
12
UK
Rolex Submariner 116613LN
Rolex Submariner 116613LN
£9,800
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
221
UK
Rolex Sea-Dweller
Rolex Sea-Dweller
£10,610
Seller
Guardian Of Time
751
UK
Breitling Avenger II GMT A3239011/C872/170A
Breitling Avenger II GMT A3239011/C872/170A
£2,419
Seller
Your Luxury Time LTD
302
UK
Omega Speedmaster Professional Moonwatch
Omega Speedmaster Professional Moonwatch
£5,700
Seller
Maunder Watch Co
26
UK
Omega Seamaster Planet Ocean Chrono 2210.50.00
Omega Seamaster Planet Ocean Chrono 2210.50.00
£3,150
Seller
Parkers Jewellers Limited
6
UK
Breitling 2008 Chronomat Evolution, Steel & Rose Gold, C13356,...
Breitling 2008 Chronomat Evolution, Steel & Rose Gold, C13356,...
£4,795
Seller
Pomerance Boutique
67
UK
Omega Watch Seamaster 300m 2254.50.00
Omega Watch Seamaster 300m 2254.50.00
£2,350
Seller
Watchfinder.co.uk Ltd
UK
Bremont ALT1-C ALT1-C/WH-BK  RRP £4,895
TOP
Bremont ALT1-C ALT1-C/WH-BK RRP £4,895
£3,550
Seller
The Watch Directory
56
UK
Omega Seamaster Diver 300 M
Omega Seamaster Diver 300 M
£2,295
Seller
Hackett Watches Ltd
6
UK
Rolex GMT-Master II 116758SARU
Rolex GMT-Master II 116758SARU
£115,000
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
221
UK
Breitling Navitimer 01
Breitling Navitimer 01
£4,316
Seller
Guardian Of Time
751
UK
Omega Speedmaster Professional Moonwatch Moonphase
Omega Speedmaster Professional Moonwatch Moonphase
£5,890
Seller
Your Luxury Time LTD
302
UK
Rolex Air King
Rolex Air King
£4,000
Seller
Maunder Watch Co
26
UK
Omega Seamaster Diver 300M 212.30.41.20.01.003
Omega Seamaster Diver 300M 212.30.41.20.01.003
£2,095
Seller
CHRONO WATCH
94
UK
Breitling Bentley Motors
Breitling Bentley Motors
£3,555
Seller
Jigsaw Watches
28
UK
Omega Watch Speedmaster Dark Side of the Moon 311.92.44.51.01.003
Omega Watch Speedmaster Dark Side of the Moon 311.92.44.51.01.003
£6,150
Seller
Watchfinder.co.uk Ltd
UK
Omega Seamaster Diver 300M 212.30.41.20.01.003
TOP
Omega Seamaster Diver 300M 212.30.41.20.01.003
£2,450
Seller
The Watch Directory
56
UK
TAG Heuer Grand Carrera CAV511B
TAG Heuer Grand Carrera CAV511B
£2,695
Seller
Hackett Watches Ltd
6
UK
Rolex Sea-Dweller NOS 16600
Rolex Sea-Dweller NOS 16600
£9,250
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
221
UK
Breitling Superocean II 44
Breitling Superocean II 44
£2,293
Seller
Guardian Of Time
751
UK
Omega 212.30.41.20.03.001
Omega 212.30.41.20.03.001
£2,275
Seller
Your Luxury Time LTD
302
UK
Omega De Ville Hour Vision 431.30.41.21.02.001
Omega De Ville Hour Vision 431.30.41.21.02.001
£2,595
Seller
Watches of Sutton Ltd
26
UK
Rolex Oyster Perpetual Ladies with Salmon Dial, Ref: 67180
Rolex Oyster Perpetual Ladies with Salmon Dial, Ref: 67180
£2,150
Seller
Tempvs Ltd
110
UK
Breitling 2016 Superocean Héritage 46, A1732016, Box & Papers
Breitling 2016 Superocean Héritage 46, A1732016, Box & Papers
£2,595
Seller
Pomerance Boutique
67
UK
Panerai Watch Luminor 1950 PAM00127
Panerai Watch Luminor 1950 PAM00127
£12,750
Seller
Watchfinder.co.uk Ltd
UK
Omega Seamaster Aqua Terra
Omega Seamaster Aqua Terra
£3,200
Seller
John Bull & Company Ltd
11
UK
Rolex Milgauss Steel 40mm
Rolex Milgauss Steel 40mm
£4,126
Seller
Noblesse LP
103
UK
Rolex Yacht-Master Gold Gents 16628
Rolex Yacht-Master Gold Gents 16628
£13,500
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
221
UK
Omega De Ville Prestige
Omega De Ville Prestige
£1,951
Seller
Guardian Of Time
751
UK
Omega Seamaster Planet Ocean 215.33.44.21.03.001
Omega Seamaster Planet Ocean 215.33.44.21.03.001
£3,615
Seller
Your Luxury Time LTD
302
UK
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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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