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Rolex Day-Date 118346 - Serviced By Rolex
TOP
Rolex Day-Date 118346 - Serviced By Rolex
£27,995
Free shipping
Seller
Mark Worthington Jewellers
16
UK
Rolex Daytona 116520 N.O.S New Old Stock 2011
TOP
Rolex Daytona 116520 N.O.S New Old Stock 2011
£15,314
Seller
MMC RIVIERA
 
MC
Breitling Chronomat 41
TOP
Breitling Chronomat 41
£3,995
Free shipping
Seller
Swiss Timepieces LTD
10
UK
Rolex Sea-Dweller Deepsea
TOP
Rolex Sea-Dweller Deepsea
£9,650
Seller
Swiss Time Online
 
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
65
UK
Rolex Sea-Dweller
TOP
Rolex Sea-Dweller
£10,710
Seller
WatchTraderUK
 
UK
Ulysse Nardin UN Maxi Marine Chronometer 43mm
TOP
Ulysse Nardin UN Maxi Marine Chronometer 43mm
£8,548
Seller
Noblesse LP
5
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
8
UK
Breitling Bentley Motors
TOP
Breitling Bentley Motors
£3,250
Seller
Kings Hill Jewellery
 
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
47
UK
Omega Seamaster 300 Spectre 007 James Bond Limited Edition
Omega Seamaster 300 Spectre 007 James Bond Limited Edition
£6,500
Seller
Swiss Horology
 
UK
Omega Seamaster Aqua Terra
Omega Seamaster Aqua Terra
£2,495
Free shipping
Seller
PRESTIGE WATCHES AND JEWELLERY
9
UK
Vacheron Constantin Overseas Automatic Chronometer
TOP
Vacheron Constantin Overseas Automatic Chronometer
£4,375
Seller
Private seller
 
UK
Rolex Rare S/S O/P UAE Air Force Pepsi Bezel GMT-Master...
Rolex Rare S/S O/P UAE Air Force Pepsi Bezel GMT-Master...
£95,000
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
65
UK
Breitling Mulliner Tourbillon Rose Gold Manual - H18841TA/G602
Breitling Mulliner Tourbillon Rose Gold Manual - H18841TA/G602
£75,000
Seller
H&Y Jewellery
12
UK
Ulysse Nardin Manufacture 43 Limited 888 266 67
TOP
Ulysse Nardin Manufacture 43 Limited 888 266 67
£9,159
Seller
Noblesse LP
5
UK
Omega Seamaster 300m Automatic Co-Axial 212.30.41.20.01.003
TOP
Omega Seamaster 300m Automatic Co-Axial 212.30.41.20.01.003
£2,495
Free shipping
Seller
JPA Watch Company Ltd
8
UK
Omega Seamaster 300M Diver Co-Axial 212.30.41.20.01.003
Omega Seamaster 300M Diver Co-Axial 212.30.41.20.01.003
£2,095
Free shipping
Seller
ChronoEdge
63
UK
Rolex Submariner Date LV Ref 16610T  Last Series (With Rolex Box)
Rolex Submariner Date LV Ref 16610T Last Series (With Rolex Box)
£6,846
Free shipping
Seller
Watch Center London
341
UK
Rolex Datejust 41 New Model "5 Year Warranty"
Rolex Datejust 41 New Model "5 Year Warranty"
£6,350
Free shipping
Seller
Watch Club
11
UK
Breitling Skyracer Raven
Breitling Skyracer Raven
£2,995
Free shipping
Seller
PRESTIGE WATCHES AND JEWELLERY
9
UK
Rolex Sea-Dweller Deepsea
TOP
Rolex Sea-Dweller Deepsea
£10,500
Seller
Private seller
 
UK
Rolex Sky-Dweller Unworn Steel 326932
Rolex Sky-Dweller Unworn Steel 326932
£15,500
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
65
UK
Rolex GMT Master II 2 Ice Baguette Diamonds Fully Iced out
TOP
Rolex GMT Master II 2 Ice Baguette Diamonds Fully Iced out
£43,240
Seller
LUXUS RITTER GmbH & Co. KG
49
DE
A. Lange & Söhne 1815 Auf & Ab Platin white dial Luxus...
TOP
A. Lange & Söhne 1815 Auf & Ab Platin white dial Luxus...
£13,512
Free shipping
Seller
Uhrenkapital
177
DE
Omega Seamaster Planet Ocean Automatic 45.5mm Co-axial
TOP
Omega Seamaster Planet Ocean Automatic 45.5mm Co-axial
£3,495
Seller
JPA Watch Company Ltd
8
UK
Omega Seamaster Planet Ocean 600M Co-Axial
Omega Seamaster Planet Ocean 600M Co-Axial
£3,350
Free shipping
Seller
ChronoEdge
63
UK
Omega Seamaster Chronograph Diver 300 M Titanium
Omega Seamaster Chronograph Diver 300 M Titanium
£2,431
Free shipping
Seller
Watch Center London
341
UK
Rolex Submariner 1680 Meter First Mark I
TOP
Rolex Submariner 1680 Meter First Mark I
£8,558
Free shipping
Seller
MASTROLORENZI S.A.S DI MATTIA MASTROLORENZI & CO.
46
IT
Omega Seamaster Aqua Terra
Omega Seamaster Aqua Terra
£2,695
Seller
PRESTIGE WATCHES AND JEWELLERY
9
UK
Breitling Navitimer 01 Limited Edition
TOP
Breitling Navitimer 01 Limited Edition
£5,995
Seller
Private seller
 
UK
Rolex S/S White Dial Zenith Movement Cosmograph Daytona 16520
Rolex S/S White Dial Zenith Movement Cosmograph Daytona 16520
£12,950
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
65
UK
Franck Muller Vanguard Iced Out Diamonds Full Pave Dial
TOP
Franck Muller Vanguard Iced Out Diamonds Full Pave Dial
£14,188
Seller
LUXUS RITTER GmbH & Co. KG
49
DE
Rolex Sea-Dweller  50th Anniversary
Rolex Sea-Dweller 50th Anniversary
£11,795
Free shipping
Seller
Watch Club
11
UK
Omega Seamaster Planet Ocean 232.30.44.22.03.001
TOP
Omega Seamaster Planet Ocean 232.30.44.22.03.001
£4,350
Free shipping
Seller
JPA Watch Company Ltd
8
UK
Rolex Explorer I 39mm Rubber B Band Top 214270 Klassiker
TOP
Rolex Explorer I 39mm Rubber B Band Top 214270 Klassiker
£3,918
Seller
Uhrenkapital
177
DE
Breitling Chronomat 41 18k Rose & Steel
Breitling Chronomat 41 18k Rose & Steel
£4,683
Seller
Watch Center London
341
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
5
UK
Omega Seamaster Planet Ocean 600M Co-Axial
TOP
Omega Seamaster Planet Ocean 600M Co-Axial
£16,978
Free shipping
Seller
Rent a Box Schmuck und Uhren AG
 
CH
Omega Seamaster
Omega Seamaster
£3,500
Seller
Humberstones Jewellers
 
UK
Rolex S/S Rare Mark I Dial Flat 4 Green Bezel Submariner 16610LV
Rolex S/S Rare Mark I Dial Flat 4 Green Bezel Submariner 16610LV
£9,500
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
65
UK
Rolex DATEJUST II Special Edition Tweety Baguette Lünette Bezel
TOP
Rolex DATEJUST II Special Edition Tweety Baguette Lünette Bezel
£8,828
Seller
LUXUS RITTER GmbH & Co. KG
49
DE
Rolex Submariner Latest Cerachrom Model "Rolex Warranty"
Rolex Submariner Latest Cerachrom Model "Rolex Warranty"
£5,950
Free shipping
Seller
Watch Club
11
UK
Omega Seamaster Planet Ocean
TOP
Omega Seamaster Planet Ocean
£4,295
Free shipping
Seller
JPA Watch Company Ltd
8
UK
Rolex Sea-Dweller 126600 43mm
Rolex Sea-Dweller 126600 43mm
£11,500
Free shipping
Seller
Global Watch Shop
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
£2,252
Free shipping
Seller
Watch Center London
341
UK
Panerai Luminor Marina Lefth-Handed PAM00026
TOP
Panerai Luminor Marina Lefth-Handed PAM00026
£7,117
Free shipping
Seller
MASTROLORENZI S.A.S DI MATTIA MASTROLORENZI & CO.
46
IT
Chopard G.P.M.H. Chrono
Chopard G.P.M.H. Chrono
£4,549
Free shipping
Seller
WatchesofMayfair.com
193
UK
Breitling Colt Lady
Breitling Colt Lady
£1,275
Free shipping
Seller
PRESTIGE WATCHES AND JEWELLERY
9
UK
Rolex 18k Y/G Rainbow Sapphire Bezel Dia Daytona B&P...
Rolex 18k Y/G Rainbow Sapphire Bezel Dia Daytona B&P...
£155,000
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
65
UK
Rolex Sea-Dweller 43mm ref. 126600
TOP
Rolex Sea-Dweller 43mm ref. 126600
£10,225
Seller
Timeless2015
 
IT
Panerai Luminor Chrono
TOP
Panerai Luminor Chrono
£4,600
Seller
Private seller
 
UK
Omega Seamaster Planet Ocean 215.30.44.21.03.001
TOP
Omega Seamaster Planet Ocean 215.30.44.21.03.001
£3,695
Free shipping
Seller
JPA Watch Company Ltd
8
UK
Rolex Sea-Dweller Deepsea
Rolex Sea-Dweller Deepsea
£11,950
Seller
Maunder Watch Co
 
UK
Patek Philippe World Time 5575G
Patek Philippe World Time 5575G
£77,450
Free shipping
Seller
A Collected Man
5
UK
Omega Seamaster Diver 300m Chronograph Full Set
Omega Seamaster Diver 300m Chronograph Full Set
£2,341
Free shipping
Seller
Watch Center London
341
UK
Breitling Avenger Blackbird
Breitling Avenger Blackbird
£3,081
Free shipping
Seller
WatchesofMayfair.com
193
UK
Omega Seamaster Hercules Custom Spectre DLC Coated Stainless...
Omega Seamaster Hercules Custom Spectre DLC Coated Stainless...
£6,995
Free shipping
Seller
Xupes.com
54
UK
Rolex Stainless Steel Black Dial Sea-Dweller NOS Gents B&P...
Rolex Stainless Steel Black Dial Sea-Dweller NOS Gents B&P...
£9,250
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
65
UK
Omega Speedmaster Racing Co-Axial Chronograph 40 MM Ref....
TOP
Omega Speedmaster Racing Co-Axial Chronograph 40 MM Ref....
£2,477
Seller
WINGOO WATCHES
203
IT
Audemars Piguet Royal Oak Rubens Barrichello II Limited...
TOP
Audemars Piguet Royal Oak Rubens Barrichello II Limited...
£54,250
Seller
Private seller
 
UK
Omega De Ville Ladymatic Co-axial  425.30.34.20.05.001
Omega De Ville Ladymatic Co-axial 425.30.34.20.05.001
£2,895
Free shipping
Seller
ChronoEdge
63
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.