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Omega De Ville Prestige | Original Diamond & Gold dial | 24.7mm
£1,100
Seller
Freddie Keeble Watches & Diamonds
9
UK
TOP
Rolex Datejust 41 Blue Roman | Jubilee Steel | 2019 UK Unworn
£8,500
Seller
Freddie Keeble Watches & Diamonds
9
UK
TOP
Omega Speedmaster Racing
£5,450
Seller
Chase Hattan
42
UK
TOP
Rolex GMT-Master 16700 A-Serie "swiss only" B+P
£10,436
Seller
Uhrtreff
124
DE
Omega Seamaster Professional Date Watch 41mm 2254.50
£2,374
Seller
Sumpters Jewelry
26
US
Omega Seamaster GMT 2234.50.00 50th Avinversary Edition Mens...
£2,213
Free shipping
Seller
Phigora
259
US
TOP
Rolex Submariner 116613LB - Blue - 2017
£11,350
Seller
Miltons Diamonds
69
UK
TOP
Omega Olympic official timekeeper pink gold full set
£8,695
Seller
TempoInverso.com / Gift and Communication LTD
18
UK
TOP
Breitling Premier B01 Chronograph 42 Panda Dial AB0118221G1X2
£4,719
Seller
Premium Watches
126
UK
Rolex Submariner Kermit Flat 4 16610LV
£19,500
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
370
UK
Omega Seamaster 300M Spectre Limited Edition - B&P 2015
£8,530
Seller
Mark Worthington Jewellers
207
UK
Omega Seamaster 007 James Bond Stainless Steel 23230422101004...
£5,699
Seller
Xupes.com
236
UK
Omega Constellation Cal.561 18ct 1966
£3,950
Seller
Vintage Gold Watches London Limited
 
UK
Rolex Oyster Perpetual Date Submariner Two Tone Blue Slate...
£8,938
Seller
Sumpters Jewelry
26
US
Omega Seamaster Planet Ocean 600M Co-axial Master Chronometer
£3,975
Free shipping
Seller
ChronoEdge
238
UK
TOP
Rolex GMT Master II 16710 Coke Oysterband K-Serie All Black +...
£11,911
Seller
Uhrenkapital
482
DE
Breitling Colt Automatic Mens Steel Watch, B&Ps
£1,750
Seller
WT Time Pieces
63
UK
Rolex 126600 Sea-Dweller 43 Red Writing - Mark I Anniversary...
£11,550
Free shipping
Seller
Watch Club
92
UK
Rolex Big Red Daytona 6263
£79,950
Free shipping
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Watches & Jewellery of Bond Street Ltd
370
UK
Breitling Galactic 29 M.O.P Diamond Dial Unworn
£3,320
Seller
Mark Worthington Jewellers
207
UK
Omega Speedmaster Moonwatch Dark side of the moon full set
£6,038
Seller
TempoInverso.com / Gift and Communication LTD
18
UK
Rolex Oyster Perpetual 9ct 1955 ‘Explorer’ Dial
£4,600
Seller
Vintage Gold Watches London Limited
 
UK
F.P.Journe Chronomètre Souverain Black Label
£27,000
Free shipping
Seller
A Collected Man
20
UK
Omega Seamaster Diver 300M Co-Axial Chronograph
£3,325
Free shipping
Seller
ChronoEdge
238
UK
Omega Seamaster Planet Ocean 600 M 43.5 MM
£3,895
Free shipping
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JPA Watch Company Ltd
85
UK
Rolex Explorer I Stainless Steel 1016 - COM1782
£12,500
Seller
Xupes.com
236
UK
Chopard 161926-5001 L.U.C Quattro - 9 Day Power Reserve
£14,750
Free shipping
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Watch Club
92
UK
Rolex Datejust 16233
£8,500
Free shipping
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Watches & Jewellery of Bond Street Ltd
370
UK
Rolex Datejust 41 Wimbledon Dial Fluted Bezel
£8,850
Seller
Mark Worthington Jewellers
207
UK
Omega Speedmaster Racing Mens Steel Watch
£4,499
Seller
WT Time Pieces
63
UK
Omega Constellation Cal.354 18ct Deluxe 1954
£7,450
Seller
Vintage Gold Watches London Limited
 
UK
Laurent Ferrier Galet Square Micro-Rotor LF 229.01
£28,500
Free shipping
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A Collected Man
20
UK
TAG Heuer Grand Carrera Calibre 6 Automatic WAV511B.FC6224
£1,495
Free shipping
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ChronoEdge
238
UK
Breitling Chronomat Rose gold - ref HB011012/B957
£12,629
Seller
H&Y Jewellery
54
UK
Omega Speedmaster 50th Anniversary Chronograph Rose Gold...
£16,999
Seller
Xupes.com
236
UK
Rolex 1002 Oyster Perpetual 34mm - 1968 Chronometer Certificate
£4,650
Free shipping
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Watch Club
92
UK
Rolex Daytona 116509
£23,000
Free shipping
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Watches & Jewellery of Bond Street Ltd
370
UK
Omega Seamaster Aqua Terra 150M 41mm - 2019 Unworn
£3,850
Seller
Mark Worthington Jewellers
207
UK
Omega Speedmaster Professional Moonwatch 311.92.44.51.01.005
£6,780
Seller
Your Luxury Time LTD
715
UK
Omega Seamaster Cal.565 De Ville 18ct 1967
£2,950
Seller
Vintage Gold Watches London Limited
 
UK
Rolex Daytona Zenith | 16528 | yellow gold | black dial | full...
£38,250
Free shipping
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A Collected Man
20
UK
Omega Speedmaster Racing Co-Axial Master Chronograph
£5,360
Free shipping
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ChronoEdge
238
UK
Omega Seamaster 300
£3,500
Seller
Watches of Lancashire
29
UK
Rolex Submariner Non Date Tropical Dial Stainless Steel 5513 -...
£29,999
Seller
Xupes.com
236
UK
Omega Seamaster Planet Ocean 44mm 215.30.44.21.03.001
£3,895
Free shipping
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JPA Watch Company Ltd
85
UK
Rolex Submariner Tropical 1680
£29,500
Free shipping
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Watches & Jewellery of Bond Street Ltd
370
UK
Omega Seamaster Diver 300 M 50th Anniversary James Bond...
£3,850
Seller
Mark Worthington Jewellers
207
UK
TOP
Omega Constellations 1960 Chronometer Soild 18k gold case an...
£3,995
Seller
Private Seller
 
UK
Omega Constellation Cal.561 18ct 1961
£3,500
Seller
Vintage Gold Watches London Limited
 
UK
Rolex Zenith Daytona 16520
£28,750
Free shipping
Seller
A Collected Man
20
UK
Omega De Ville Prestige Co-Axial
£2,120
Free shipping
Seller
ChronoEdge
238
UK
Breitling Chronomat 44 two tone CB011012/B957
£7,393
Seller
H&Y Jewellery
54
UK
Rolex Submariner Date Stainless Steel 16800 - W5292
£7,199
Seller
Xupes.com
236
UK
Rolex Deepsea Seadweller 116660 D Blue James Cameron 2016 UNWORN
£11,495
Free shipping
Seller
JPA Watch Company Ltd
85
UK
Rolex Submariner Date 1680
£10,250
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
370
UK
Omega Speedmaster Moonwatch 50th Anniversary - Box & Papers 2007
£6,970
Seller
Mark Worthington Jewellers
207
UK
Omega Seamaster DIVER 300M OMEGA CO-AXIAL MASTER CHRONOMETER...
£3,381
Seller
Your Luxury Time LTD
715
UK
Rolex Oyster Perpetual Bubbleback 1945 14ct Pink Gold Chronometer
£5,500
Seller
Vintage Gold Watches London Limited
 
UK
F.P.Journe Chronomètre Holland & Holland
£43,000
Free shipping
Seller
A Collected Man
20
UK
Omega Seamaster “Railmaster” 150M Co-axial Master Chronometer
£3,175
Free shipping
Seller
ChronoEdge
238
UK
Omega Seamaster 300m 212.30.41.20.03.001 - Unworn 2018
£2,600
Seller
Miltons Diamonds
69
UK
Rolex GMT-Master Gilt Underline Dial Stainless Steel 1675 -...
£24,999
Seller
Xupes.com
236
UK
Omega Seamaster Aqua Terra GMT Chronograph
£5,195
Free shipping
Seller
JPA Watch Company Ltd
85
UK
Rolex Submariner Date 116610LN
£9,250
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
370
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.