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Rolex Cellini Time 50509 aus 2016 LC100
Rolex Cellini Time 50509 aus 2016 LC100
£9,005
Seller
Uhren2000 GmbH
202
DE
Omega Seamaster Aqua Terra 150M Co-Axial 34 MM Ref. 231.15.34....
Omega Seamaster Aqua Terra 150M Co-Axial 34 MM Ref. 231.15.34....
£7,065
Seller
WINGOO WATCHES
160
IT
Rolex Daytona 16520 Zenith 1995
Rolex Daytona 16520 Zenith 1995
£11,830
Seller
Phigora
58
US
Omega Seamaster 300 M Midsize Chronometer 2551.80
Omega Seamaster 300 M Midsize Chronometer 2551.80
£1,274
Seller
PreOwned Watch Shop
8
US
Vacheron Constantin Overseas Automatic Chronometer
Vacheron Constantin Overseas Automatic Chronometer
£4,575
Seller
Private seller
 
UK
Omega Seamaster Planet Ocean - men's wristwatch - 2007
Omega Seamaster Planet Ocean - men's wristwatch - 2007
£2,217
Estimated price
Seller
Catawiki BV
 
Rolex Submariner Date 40mm Steel Ceramic
Rolex Submariner Date 40mm Steel Ceramic
£5,521
Seller
Noblesse LP
 
UK
Patek Philippe World Time
Patek Philippe World Time
£77,450
Seller
A Collected Man
5
UK
Omega Speedmaster 'Dark Side of the Moon' NEW
Omega Speedmaster 'Dark Side of the Moon' NEW
£5,850
Seller
Tempo and Time Ltd
9
UK
Rolex Sea-Dweller
Rolex Sea-Dweller
£6,641
Seller
TempoInverso.com / Gift and Communication LTD
UK
Omega Skyfall limited edition seamaster planet ocean
Omega Skyfall limited edition seamaster planet ocean
£5,295
Seller
The Cheshire Watch Company Ltd
UK
Rolex Datejust Steel & Gold Champagne Diamond Dial, 16233
Rolex Datejust Steel & Gold Champagne Diamond Dial, 16233
£3,850
Free shipping
Seller
Tempvs Ltd
41
UK
Rolex Daytona (White dial)
Rolex Daytona (White dial)
£11,750
Seller
Private seller
 
UK
Louis Moinet Tempograph
Louis Moinet Tempograph
£10,000
Seller
Private seller
 
UK
Audemars Piguet Royal Oak Rubens Barrichello II Limited...
Audemars Piguet Royal Oak Rubens Barrichello II Limited...
£54,250
Seller
Private seller
 
UK
Omega Seamaster 300 M Chronometer 2531.80  41mm
Omega Seamaster 300 M Chronometer 2531.80 41mm
£1,558
Seller
PreOwned Watch Shop
8
US
Omega Speedmaster 'Broad Arrow' automatic men's...
Omega Speedmaster 'Broad Arrow' automatic men's...
£2,401
Estimated price
Seller
Catawiki BV
 
Ulysse Nardin Manufacture 43 Limited 888 266 67
Ulysse Nardin Manufacture 43 Limited 888 266 67
£8,676
Seller
Noblesse LP
 
UK
IWC Ingenieur Chronograph Edition "74th Members Meeting at...
IWC Ingenieur Chronograph Edition "74th Members Meeting at...
£14,200
Seller
Private seller
 
UK
Omega Speedmaster Titanium Gents 311.93.44.51.03.001
Omega Speedmaster Titanium Gents 311.93.44.51.03.001
£4,995
Free shipping
Seller
Xupes.com
44
UK
Omega Seamaster 42mm | 300m Chronometer Blue Dial | 2255.80
Omega Seamaster 42mm | 300m Chronometer Blue Dial | 2255.80
£2,200
Free shipping
Seller
Freddie Keeble Watches & Diamonds
UK
Rolex Datejust Midsize 18k White Gold with Diamond Dial,...
Rolex Datejust Midsize 18k White Gold with Diamond Dial,...
£7,500
Free shipping
Seller
Tempvs Ltd
41
UK
Breitling Superocean Chronograph II
Breitling Superocean Chronograph II
£3,650
Seller
JPA Watch Company Ltd
5
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
54
UK
Omega Planet Ocean 600 M Co-Axial Chronograph 45.5MM
Omega Planet Ocean 600 M Co-Axial Chronograph 45.5MM
£2,599
Seller
PreOwned Watch Shop
8
US
Chopard Mille Miglia GTS Powerreserve-Gent-2016
Chopard Mille Miglia GTS Powerreserve-Gent-2016
£3,417
Estimated price
Seller
Catawiki BV
 
Omega Deville 18K Gold & SS (Unworn)
Omega Deville 18K Gold & SS (Unworn)
£3,250
Seller
Watches Of Westminster
21
UK
Breitling Superocean 44 Abyss A17391
Breitling Superocean 44 Abyss A17391
£1,800
Seller
Private seller
 
UK
Rolex Explorer 6610 steel
Rolex Explorer 6610 steel
£11,850
Seller
A Collected Man
5
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
Rolex 18k Day-Date, Brown Degrade Stella Diamond Dial, Ref: 1803
Rolex 18k Day-Date, Brown Degrade Stella Diamond Dial, Ref: 1803
£13,750
Free shipping
Seller
Tempvs Ltd
41
UK
Rolex Sea-Dweller Deepsea
Rolex Sea-Dweller Deepsea
£9,800
Seller
Swiss Time Online
 
UK
Rolex 18k Yellow Gold Black Dial Submariner Date Gents 16618
Rolex 18k Yellow Gold Black Dial Submariner Date Gents 16618
£14,250
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
54
UK
Panerai Luminor GMT PAM 00159
Panerai Luminor GMT PAM 00159
£3,845
Seller
PreOwned Watch Shop
8
US
Omega Constellation – men's watch – 1970s
Omega Constellation – men's watch – 1970s
£785
Estimated price
Seller
Catawiki BV
 
Rolex Cosmograph Daytona 18ct Everose Gold "Full Set"
Rolex Cosmograph Daytona 18ct Everose Gold "Full Set"
£20,500
Seller
Watch Club
9
UK
Rolex Explorer II
Rolex Explorer II
£3,690
Seller
Private seller
 
UK
F.P.Journe Resonance Brass Movement Platinum 38mm
F.P.Journe Resonance Brass Movement Platinum 38mm
£34,000
Seller
A Collected Man
5
UK
Rolex DATEJUST II Special Edition HARIBO Baguette + Diamonds
Rolex DATEJUST II Special Edition HARIBO Baguette + Diamonds
£12,625
Seller
LUXUS RITTER GmbH & Co. KG
45
DE
Rolex 18k Day-Date with Tridor White Dial Diamond Bezel,...
Rolex 18k Day-Date with Tridor White Dial Diamond Bezel,...
£13,650
Free shipping
Seller
Tempvs Ltd
41
UK
Rolex Sea-Dweller (Basel 2017) 126600
Rolex Sea-Dweller (Basel 2017) 126600
£11,500
Free shipping
Seller
ChronoEdge
57
UK
Rolex 18k Y/G Rainbow Sapphire Bezel Dia Daytona B&P...
Rolex 18k Y/G Rainbow Sapphire Bezel Dia Daytona B&P...
£168,500
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
54
UK
Omega Seamaster Planet Ocean Chronograph   2210.50
Omega Seamaster Planet Ocean Chronograph 2210.50
£2,425
Seller
PreOwned Watch Shop
US
Omega Constellation mens watch 70'S
Omega Constellation mens watch 70'S
£600
Estimated price
Seller
Catawiki BV
 
Breitling Superocean 44
Breitling Superocean 44
£1,800
Seller
The Cheshire Watch Company Ltd
UK
Omega 2900.50.91 Seamaster Planet Ocean XL 45.5 mm BigSize
Omega 2900.50.91 Seamaster Planet Ocean XL 45.5 mm BigSize
£2,750
Seller
Private seller
 
UK
Rolex Oyster Perpetual Date Black Sigma Dial ref. 1500
Rolex Oyster Perpetual Date Black Sigma Dial ref. 1500
£3,250
Seller
A Collected Man
5
UK
A. Lange & Söhne 1815 Auf & Ab Platin white dial Luxus...
A. Lange & Söhne 1815 Auf & Ab Platin white dial Luxus...
£13,853
Seller
Uhrenkapital
156
DE
Chopard G.P.M.H. Chrono
Chopard G.P.M.H. Chrono
£4,664
Free shipping
Seller
WatchesofMayfair.com
169
UK
Rolex GMT Matser Vintage Nipple Dial 18K Gold Box Papers Revision
Rolex GMT Matser Vintage Nipple Dial 18K Gold Box Papers Revision
£28,816
Seller
LUXUS RITTER GmbH & Co. KG
45
DE
Rolex Platinum Ceramic Bezel Ice Blue Dial Daytona B&P ...
Rolex Platinum Ceramic Bezel Ice Blue Dial Daytona B&P ...
£38,500
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
54
UK
Omega Seamaster 300 M Midsize Chronometer 2551.80
Omega Seamaster 300 M Midsize Chronometer 2551.80
£1,321
Seller
PreOwned Watch Shop
8
US
Omega Seamaster Diver 300 M Chronograph – 2004
Omega Seamaster Diver 300 M Chronograph – 2004
£2,263
Estimated price
Seller
Catawiki BV
 
Rolex Sea-Dweller New 43mm 126600
Rolex Sea-Dweller New 43mm 126600
£11,500
Seller
Global Watch Shop
 
UK
Rolex Submariner Date
Rolex Submariner Date
£8,350
Seller
Private seller
 
UK
Rolex Oyster Perpetual Date Silver Sigma Dial ref. 1500
Rolex Oyster Perpetual Date Silver Sigma Dial ref. 1500
£3,800
Seller
A Collected Man
5
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
£2,309
Free shipping
Seller
Watch Center London
291
UK
Omega Seamaster Planet Ocean Chronograph Co-axial 600M
Omega Seamaster Planet Ocean Chronograph Co-axial 600M
£4,795
Free shipping
Seller
ChronoEdge
57
UK
Franck Muller Vanguard Iced Out Diamonds Full Pave Dial
Franck Muller Vanguard Iced Out Diamonds Full Pave Dial
£16,532
Seller
LUXUS RITTER GmbH & Co. KG
45
DE
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
54
UK
Omega DeVille Co-Axial Chronograph  4841.31.32
Omega DeVille Co-Axial Chronograph 4841.31.32
£2,283
Seller
PreOwned Watch Shop
8
US
Paul Picot Atelier 1200 – Power reserve
Paul Picot Atelier 1200 – Power reserve
£1,201
Estimated price
Seller
Catawiki BV
 

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.