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Rolex 18k Y/G Rainbow Sapphire Bezel Dia Daytona B&P...
TOP
Rolex 18k Y/G Rainbow Sapphire Bezel Dia Daytona B&P...
£155,000
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
85
UK
Chopard MILLE MIGLIA Auto CLASSIC YACHTING 2012
TOP
Chopard MILLE MIGLIA Auto CLASSIC YACHTING 2012
£3,326
Seller
Chronographe.fr
 
FR
Breitling Superocean Héritage 46
TOP
Breitling Superocean Héritage 46
£2,650
Free shipping
Seller
Watch Philosophy
 
UK
Rolex Sea-Dweller
Rolex Sea-Dweller
£11,450
Seller
CARR
UK
Rolex 18k W/Gold Unworn Pavé Diamond Dial Daytona B&P...
TOP
Rolex 18k W/Gold Unworn Pavé Diamond Dial Daytona B&P...
£95,000
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
85
UK
Omega Seamaster Planet Ocean
TOP
Omega Seamaster Planet Ocean
£2,139
Seller
Swiss Time Traders
 
UK
Omega De Ville Prestige Co Axial
TOP
Omega De Ville Prestige Co Axial
£1,850
Seller
David Summerfield Ltd
17
UK
Omega Speedmaster Professional Moonwatch 311.92.44.51.01.003
TOP
Omega Speedmaster Professional Moonwatch 311.92.44.51.01.003
£6,295
Free shipping
Seller
JPA Watch Company Ltd
14
UK
Rolex Sea-Dweller Deepsea D-Blue
TOP
Rolex Sea-Dweller Deepsea D-Blue
£12,500
Free shipping
Seller
Swiss Watch Trader
 
UK
Breitling Chronomat 41
TOP
Breitling Chronomat 41
£3,745
Free shipping
Seller
Swiss Timepieces LTD
12
UK
Ulysse Nardin UN Maxi Marine Chronometer 43mm
TOP
Ulysse Nardin UN Maxi Marine Chronometer 43mm
£8,593
Seller
Noblesse LP
12
UK
Bremont U2 SS – 2014 – Full Set
TOP
Bremont U2 SS – 2014 – Full Set
£2,200
Seller
Oakleigh Watches
16
UK
Rolex Sea-Dweller Deepsea
Rolex Sea-Dweller Deepsea
£10,995
Seller
CARR
UK
Rolex Daytona Gold Mother Of Pearl Dial Baguette Diamond Bezel
TOP
Rolex Daytona Gold Mother Of Pearl Dial Baguette Diamond Bezel
£49,950
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
85
UK
Omega Seamaster Planet Ocean
TOP
Omega Seamaster Planet Ocean
£3,400
Seller
Swiss Time Traders
 
UK
Omega Vintage Speedmaster, Straight Writing
TOP
Omega Vintage Speedmaster, Straight Writing
£5,500
Free shipping
Seller
Tempvs Ltd
62
UK
Omega Seamaster 300m Automatic Co-Axial 212.30.41.20.03.001
TOP
Omega Seamaster 300m Automatic Co-Axial 212.30.41.20.03.001
£2,495
Free shipping
Seller
JPA Watch Company Ltd
14
UK
Breitling Chronomat 41 Airborne AB0144 - Box & Papers 2016
TOP
Breitling Chronomat 41 Airborne AB0144 - Box & Papers 2016
£3,970
Free shipping
Seller
Mark Worthington Jewellers
20
UK
Chopard L.U.C Tourbillon Heritage 161911-9001 RRP £152,800 Ltd Ed
TOP
Chopard L.U.C Tourbillon Heritage 161911-9001 RRP £152,800 Ltd Ed
£37,500
Seller
The Watch Directory
39
UK
Breitling Bentley Motors
TOP
Breitling Bentley Motors
£3,250
Seller
Kings Hill Jewellery
 
UK
Omega Seamster Aqua Terra 'Good Planet' NEW
TOP
Omega Seamster Aqua Terra 'Good Planet' NEW
£3,750
Seller
Tempo and Time Ltd
UK
Rolex Sea-Dweller Deepsea
TOP
Rolex Sea-Dweller Deepsea
£10,300
Seller
Private seller
 
UK
Rolex Vintage UAE Air Force Pepsi Bezel GMT-Master B&P 1675
Rolex Vintage UAE Air Force Pepsi Bezel GMT-Master B&P 1675
£95,000
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
85
UK
Omega Seamaster Diver 300 M
TOP
Omega Seamaster Diver 300 M
£2,951
Seller
Swiss Time Traders
 
UK
Rolex 18k Day-Date Silver Step Dial Ref: 1803
TOP
Rolex 18k Day-Date Silver Step Dial Ref: 1803
£9,450
Free shipping
Seller
Tempvs Ltd
62
UK
Omega Seamaster Planet Ocean Gmt 232.30.44.22.03.001
TOP
Omega Seamaster Planet Ocean Gmt 232.30.44.22.03.001
£4,295
Free shipping
Seller
JPA Watch Company Ltd
14
UK
Omega Seamaster Bullhead 225.12.43.50.01.001 - Unworn 2016
TOP
Omega Seamaster Bullhead 225.12.43.50.01.001 - Unworn 2016
£5,510
Free shipping
Seller
Mark Worthington Jewellers
20
UK
Rolex Datejust 41 Steel & Gold 126334(All Factory stickers...
Rolex Datejust 41 Steel & Gold 126334(All Factory stickers...
£6,595
Free shipping
Seller
ChronoEdge
68
UK
Omega Constellation Pie Pan 18K Gold Automatic Service 11/17
TOP
Omega Constellation Pie Pan 18K Gold Automatic Service 11/17
£3,597
Seller
Timeless Watches GmbH
107
DE
Omega Constellation Double Eagle 1503.30.00
Omega Constellation Double Eagle 1503.30.00
£1,699
Free shipping
Seller
Watches of Japan
 
UK
Rolex Datejust
TOP
Rolex Datejust
£4,790
Seller
Private seller
 
UK
Rolex 18k W/G Black Racing Dial Cosmograph Daytona Gents 116509
Rolex 18k W/G Black Racing Dial Cosmograph Daytona Gents 116509
£15,500
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
85
UK
F.P.Journe Resonance Brass Movement Platinum 38mm
F.P.Journe Resonance Brass Movement Platinum 38mm
£34,000
Free shipping
Seller
A Collected Man
6
UK
Rolex 18k Day-Date, Brown Degrade Stella Diamond Dial, Ref: 1803
TOP
Rolex 18k Day-Date, Brown Degrade Stella Diamond Dial, Ref: 1803
£13,750
Free shipping
Seller
Tempvs Ltd
62
UK
Omega Constellation Rose Gold Co-Axial 123.20.35.20.02.001
Omega Constellation Rose Gold Co-Axial 123.20.35.20.02.001
£2,800
Free shipping
Seller
Cashbrokers Kingston
 
UK
Omega Seamaster Diver 300m Chronograph Full Set
Omega Seamaster Diver 300m Chronograph Full Set
£2,343
Free shipping
Seller
Watch Center London
402
UK
Omega Seamaster Planet Ocean
Omega Seamaster Planet Ocean
£3,200
Seller
Maunder Watch Co
6
UK
Rolex LADY DATEJUST DIAMANT 18K GOLD GELBGOLD SERVICE 01/2017
TOP
Rolex LADY DATEJUST DIAMANT 18K GOLD GELBGOLD SERVICE 01/2017
£6,121
Seller
Timeless Watches GmbH
107
DE
Omega Seamaster Planet Ocean Chronograph Titanium Co-Axial 600M
Omega Seamaster Planet Ocean Chronograph Titanium Co-Axial 600M
£4,995
Free shipping
Seller
ChronoEdge
68
UK
Panerai Luminor Chrono
TOP
Panerai Luminor Chrono
£4,500
Seller
Private seller
 
UK
Rolex Submariner Big Crown Tropical Gilt Dial NCG Steel
Rolex Submariner Big Crown Tropical Gilt Dial NCG Steel
£105,000
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
85
UK
Omega Globemaster
Omega Globemaster
£5,150
Free shipping
Seller
Watch Philosophy
 
UK
Rolex Yacht-Master Midsize Steel/Gold with Blue Dial, Ref: 68623
TOP
Rolex Yacht-Master Midsize Steel/Gold with Blue Dial, Ref: 68623
£4,950
Free shipping
Seller
Tempvs Ltd
62
UK
Omega Globemaster Omega Co-Axial Master Chronometer 39 mm
Omega Globemaster Omega Co-Axial Master Chronometer 39 mm
£4,714
Free shipping
Seller
WatchesofMayfair.com
206
UK
Omega Seamaster Chronograph Diver 300 M Titanium
Omega Seamaster Chronograph Diver 300 M Titanium
£2,433
Free shipping
Seller
Watch Center London
402
UK
Rolex Daytona Chronograph 116520 D-Serie
TOP
Rolex Daytona Chronograph 116520 D-Serie
£9,816
Free shipping
Seller
Uhrtreff
70
DE
Omega Seamaster Chronometer 18k Yellow Gold Gents 2101.21.00 -...
Omega Seamaster Chronometer 18k Yellow Gold Gents 2101.21.00 -...
£6,995
Seller
Xupes.com
58
UK
Omega Seamaster Diver 300 M Co-axial
Omega Seamaster Diver 300 M Co-axial
£2,300
Free shipping
Seller
ChronoEdge
68
UK
Breitling Navitimer 01 Limited Edition
TOP
Breitling Navitimer 01 Limited Edition
£5,995
Seller
Private seller
 
UK
Rolex S/S Unworn O/P Black Dial Ceramic Bezel Daytona B&P...
Rolex S/S Unworn O/P Black Dial Ceramic Bezel Daytona B&P...
£14,750
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
85
UK
Patek Philippe World Time 5575G
Patek Philippe World Time 5575G
£77,450
Free shipping
Seller
A Collected Man
6
UK
Omega Seamaster 300 SPECTRE Limited Edition full set
TOP
Omega Seamaster 300 SPECTRE Limited Edition full set
£7,653
Seller
TempoInverso.com / Gift and Communication LTD
UK
Omega De Ville Hour Vision
Omega De Ville Hour Vision
£12,142
Free shipping
Seller
WatchesofMayfair.com
206
UK
Omega Seamaster Chronograph Black Dial Ref. 213.30.42.40.01.001
Omega Seamaster Chronograph Black Dial Ref. 213.30.42.40.01.001
£2,254
Free shipping
Seller
Watch Center London
402
UK
Breitling Superocean Héritage Chronograph
Breitling Superocean Héritage Chronograph
£3,550
Free shipping
Seller
Watch Philosophy
 
UK
Omega Seamaster Aqua Terra XXL 18k Rose Gold Gents 23153491006...
Omega Seamaster Aqua Terra XXL 18k Rose Gold Gents 23153491006...
£9,995
Free shipping
Seller
Xupes.com
58
UK
Tudor Heritage Black Bay Automatik Dark 79230DK Lederband
TOP
Tudor Heritage Black Bay Automatik Dark 79230DK Lederband
£2,650
Seller
Uhren2000 GmbH
222
DE
Audemars Piguet Royal Oak Rubens Barrichello II Limited...
TOP
Audemars Piguet Royal Oak Rubens Barrichello II Limited...
£53,950
Seller
Private seller
 
UK
Rolex 18k Y/G Rare Omani Crest Submariner Date B&P 1680
Rolex 18k Y/G Rare Omani Crest Submariner Date B&P 1680
£55,000
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
85
UK
Rolex Datejust 41 Blue Diamond Dial 126334
Rolex Datejust 41 Blue Diamond Dial 126334
£7,450
Free shipping
Seller
Global Watch Shop
UK
Rolex Sea-Dweller Z series full set Mint condition
TOP
Rolex Sea-Dweller Z series full set Mint condition
£6,481
Seller
TempoInverso.com / Gift and Communication LTD
UK
Omega Planet Ocean 600 M Omega Co-Axial Master Chronometer...
Omega Planet Ocean 600 M Omega Co-Axial Master Chronometer...
£4,345
Free shipping
Seller
WatchesofMayfair.com
206
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.