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Rolex Daytona 116509 - Diamond Set - Serviced By Rolex
TOP
Rolex Daytona 116509 - Diamond Set - Serviced By Rolex
£22,900
Seller
Mark Worthington Jewellers
94
UK
Rolex Datejust
TOP
Rolex Datejust
£7,194
Free shipping
Seller
Luxury Swiss Made Watches
 
US
Corum Two Tone Admiral Cup Triple Calendar Chronograph 18Kt/ SS
TOP
Corum Two Tone Admiral Cup Triple Calendar Chronograph 18Kt/ SS
£3,034
Free shipping
Seller
Ye Olde Timekeepers, Inc.
14
US
Omega Seamaster Planet Ocean 600 M 43.5 MM
TOP
Omega Seamaster Planet Ocean 600 M 43.5 MM
£3,795
Free shipping
Seller
JPA Watch Company Ltd
48
UK
Bremont Watch Martin Baker MBI
Bremont Watch Martin Baker MBI
£27,500
Seller
Watchfinder.co.uk Ltd
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
185
UK
Omega 212.30.41.20.01.003
Omega 212.30.41.20.01.003
£2,233
Seller
Your Luxury Time LTD
236
UK
Chopard Grand Prix de Monaco Historique Rose & Titanium
TOP
Chopard Grand Prix de Monaco Historique Rose & Titanium
£4,766
Seller
Watch Center London
702
UK
Breitling Bentley Motors Special Edition
TOP
Breitling Bentley Motors Special Edition
£3,999
Seller
Private Seller
 
UK
Omega Seamaster Aqua Terra 150M 41mm Automatic
TOP
Omega Seamaster Aqua Terra 150M 41mm Automatic
£3,222
Seller
RedWatches
13
NL
Laurent Ferrier Galet Square Micro-Rotor Steel Grey Dial...
Laurent Ferrier Galet Square Micro-Rotor Steel Grey Dial...
£27,850
Free shipping
Seller
A Collected Man
11
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 Deepsea Seadweller 116660 D Blue James Cameron
Rolex Deepsea Seadweller 116660 D Blue James Cameron
£10,995
Free shipping
Seller
JPA Watch Company Ltd
48
UK
Omega Watch Seamaster 300m 2254.50.00
Omega Watch Seamaster 300m 2254.50.00
£2,350
Seller
Watchfinder.co.uk Ltd
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
185
UK
Omega 212.30.41.20.03.001
Omega 212.30.41.20.03.001
£2,265
Seller
Your Luxury Time LTD
236
UK
Omega Seamaster 300 Spectre Stainless Steel Men's 233324121010...
Omega Seamaster 300 Spectre Stainless Steel Men's 233324121010...
£8,195
Seller
Xupes.com
138
UK
TAG Heuer Monza Chronograph. Calibre 36 (El Primero).
TOP
TAG Heuer Monza Chronograph. Calibre 36 (El Primero).
£2,179
Seller
Private Seller
 
UK
Audemars Piguet Offshore Chronograph  AP Navy (2017) (Sealed...
TOP
Audemars Piguet Offshore Chronograph AP Navy (2017) (Sealed...
£14,650
Seller
Tempvs Ltd
102
UK
Rolex Milgauss 1019 black dial | Rolex Service Guarantee
Rolex Milgauss 1019 black dial | Rolex Service Guarantee
£23,500
Free shipping
Seller
A Collected Man
11
UK
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
£3,223
Seller
Guardian Of Time
658
UK
Rolex Sea-Dweller 126600 50th Anniversary
Rolex Sea-Dweller 126600 50th Anniversary
£10,950
Free shipping
Seller
JPA Watch Company Ltd
48
UK
Omega Watch Seamaster 300m Mid-Size 2551.80.00
Omega Watch Seamaster 300m Mid-Size 2551.80.00
£1,685
Seller
Watchfinder.co.uk Ltd
UK
Rolex GMT-Master II Unworn 126710BLRO
Rolex GMT-Master II Unworn 126710BLRO
£17,500
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
185
UK
Omega Speedmaster Professional Moonwatch Moonphase
Omega Speedmaster Professional Moonwatch Moonphase
£5,947
Seller
Your Luxury Time LTD
236
UK
Omega Seamaster 300M Mid-Size 36mm - 2551.80.00 - Box & Papers
Omega Seamaster 300M Mid-Size 36mm - 2551.80.00 - Box & Papers
£1,400
Seller
Bloombar Watches
43
UK
Bremont Boeing 100
TOP
Bremont Boeing 100
£4,400
Seller
Private Seller
 
UK
Rolex Day-Date Cognac Dial Leather Strap, Ref: 118138
TOP
Rolex Day-Date Cognac Dial Leather Strap, Ref: 118138
£10,200
Seller
Tempvs Ltd
102
UK
Omega Speedmaster Dark Side Of The Moon Black Ceramic Men's...
Omega Speedmaster Dark Side Of The Moon Black Ceramic Men's...
£6,795
Seller
Xupes.com
138
UK
Breitling Avenger Blackbird 44
Breitling Avenger Blackbird 44
£2,687
Seller
Guardian Of Time
658
UK
Rolex Sea-Dweller 126600 50th Anniversary
Rolex Sea-Dweller 126600 50th Anniversary
£10,750
Free shipping
Seller
JPA Watch Company Ltd
48
UK
Breitling Watch Chronomat Evolution C13356
Breitling Watch Chronomat Evolution C13356
£4,450
Seller
Watchfinder.co.uk Ltd
UK
Rolex Big Red Daytona 6263
Rolex Big Red Daytona 6263
£79,950
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
185
UK
Omega Seamaster Planet Ocean 215.33.44.21.03.001
Omega Seamaster Planet Ocean 215.33.44.21.03.001
£3,650
Seller
Your Luxury Time LTD
236
UK
Rolex Oysterquartz 19018 Day Date President 18K Gold Watch...
Rolex Oysterquartz 19018 Day Date President 18K Gold Watch...
£8,242
Seller
Carter's Diamonds
 
US
Omega Constellation Double Eagle Co-axial
TOP
Omega Constellation Double Eagle Co-axial
£1,599
Seller
Private Seller
 
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
102
UK
Hublot Big Bang King Power 48 mm 18k Rose Gold, B + P
Hublot Big Bang King Power 48 mm 18k Rose Gold, B + P
£28,006
Free shipping
Seller
Luxury Watches USA
 
US
Breitling Navitimer 01
Breitling Navitimer 01
£4,267
Seller
Guardian Of Time
658
UK
Omega Seamaster Planet Ocean 600mm 215.30.44.21.01.001
Omega Seamaster Planet Ocean 600mm 215.30.44.21.01.001
£3,750
Free shipping
Seller
JPA Watch Company Ltd
48
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
Rolex Transitional GMT-Master 16750
Rolex Transitional GMT-Master 16750
£17,500
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
185
UK
Omega Speedmaster Racing 326.32.40.50.02.001
Omega Speedmaster Racing 326.32.40.50.02.001
£2,488
Seller
Your Luxury Time LTD
236
UK
Rolex Submariner Stainless Steel Men's 1680 - COM1643
Rolex Submariner Stainless Steel Men's 1680 - COM1643
£11,995
Seller
Xupes.com
138
UK
Omega Seamaster Diver Professioal 300 Co-Axial
TOP
Omega Seamaster Diver Professioal 300 Co-Axial
£2,295
Seller
Private Seller
 
UK
Ulysse Nardin Manufacture 43 Limited 888 266 67
TOP
Ulysse Nardin Manufacture 43 Limited 888 266 67
£9,724
Seller
Noblesse LP
72
UK
Breitling CHRONOMAT 01 44mm REF: AB011012 FULL SET FROM 2013
Breitling CHRONOMAT 01 44mm REF: AB011012 FULL SET FROM 2013
£2,975
Seller
The Classic Watch Buyers Club Ltd.
13
UK
Omega Seamaster DIVER 300 M CO-AXIAL 41 MM
Omega Seamaster DIVER 300 M CO-AXIAL 41 MM
£2,315
Seller
Guardian Of Time
658
UK
Omega Seamaster Chronograph212.30.44.50.03.001
Omega Seamaster Chronograph212.30.44.50.03.001
£3,495
Free shipping
Seller
JPA Watch Company Ltd
48
UK
Omega Watch Seamaster 300m 233.30.41.21.01.001
Omega Watch Seamaster 300m 233.30.41.21.01.001
£3,650
Seller
Watchfinder.co.uk Ltd
UK
Rolex Submariner 16610LV
Rolex Submariner 16610LV
£10,950
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
185
UK
Omega Speedmaster Racing 326.30.40.50.01.001
Omega Speedmaster Racing 326.30.40.50.01.001
£2,578
Seller
Your Luxury Time LTD
236
UK
Rolex Submariner 1680 Nipple Dial 18K Yellow Gold Year 1967...
Rolex Submariner 1680 Nipple Dial 18K Yellow Gold Year 1967...
£46,677
Seller
Carter's Diamonds
 
US
Chopard Superfast
TOP
Chopard Superfast
£9,995
Seller
Private Seller
 
UK
Rolex GMT-Master Stainless Steel Men's 1675 - W4998
Rolex GMT-Master Stainless Steel Men's 1675 - W4998
£9,995
Seller
Xupes.com
138
UK
Rolex 2012 ENGRAVED UNPOLISHED Rolex Submariner 4-Line 40mm...
Rolex 2012 ENGRAVED UNPOLISHED Rolex Submariner 4-Line 40mm...
£5,362
Seller
Collectors Coins of Lynbrook LLC
 
US
Breitling Superocean Héritage II
Breitling Superocean Héritage II
£2,905
Seller
Guardian Of Time
658
UK
Omega Moonwatch Omega Co-Axial Chronograph 44.25 mm
Omega Moonwatch Omega Co-Axial Chronograph 44.25 mm
£6,250
Free shipping
Seller
JPA Watch Company Ltd
48
UK
Omega Watch Museum 516.53.39.50.02.001
Omega Watch Museum 516.53.39.50.02.001
£8,500
Seller
Watchfinder.co.uk Ltd
UK
Rolex Submariner Date  116619LB
Rolex Submariner Date 116619LB
£18,500
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
185
UK
Omega Seamaster Planet Ocean 215.33.40.20.01.001
Omega Seamaster Planet Ocean 215.33.40.20.01.001
£3,813
Seller
Your Luxury Time LTD
236
UK
Omega Seamaster Planet Ocean 232.30.42.21.01.003
Omega Seamaster Planet Ocean 232.30.42.21.01.003
£2,950
Seller
Ian Blowers Jewellers
30
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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