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Omega Seamaster Aqua Terra 231.10.44.50.09.001 New Steel 51mm Automatic
TOP
Omega オメガ シーマスター アクアテラ 150M 自動巻き メンズ 231.10.44.50.09.001 OMEGA...
3 047 
Verified Dealer
22
JP
Omega Seamaster Omega Seamaster Planet Ocean 600M Co-Axial Chronometer New Steel 42mm Automatic
TOP
Omega Seamaster Planet Ocean 600M 232.30.42.21.01.003
4 800 
Verified Dealer
7
IT
Rolex Datejust Very good Steel 36mm Quartz
TOP
Rolex Datejust 1603 Vintage 1966 Stainless Steel Automatic...
3 495 
Free shipping
Verified Dealer
40
US
Rolex Datejust Very good Steel 36mm Quartz
TOP
Rolex Datejust Ref.1630 "Rare Bird" Vintage 1975 18k Solid...
9 077 
Free shipping
Verified Dealer
40
US
Rolex Sea-Dweller Deepsea 116660 Very good Steel 44mm Automatic
TOP
Rolex Sea Dweller Deepsea Edelstahl 116660 Automatik 2009...
8 690 
Verified Dealer
601
DE
Audemars Piguet Royal Oak Chronograph 26022BC.OO.D002CR.01 Very good White gold 39mm Automatic Finland, Imatra
TOP
Audemars Piguet Royal Oak Chronograph SERVICED 2020 COMPLETE
22 900 
Verified Dealer
17
FI
Omega Seamaster Aqua Terra 220.10.41.21.03.002 New Steel 41mm Automatic
TOP
Omega Seamaster Aqua Terra 150M Chronometer
4 195 
Verified Dealer
244
DE
Breitling Bentley Supersports E27365 Very good Titanium 49mm Automatic
TOP
Breitling Bentley Supersports Light Body Limited Edition
5 300 
Verified Dealer
1403
NL
Rolex Sea-Dweller Deepsea 116660 Very good Steel 44mm Automatic
TOP
Rolex Sea-Dweller Deepsea 116660 V-Serie
9 190 
Verified Dealer
154
DE
Paul Picot 4101 Unworn Steel 40mm Automatic
TOP
Paul Picot Technicum
6 800 
Verified Dealer
8
IT
Rolex Oyster Perpetual Date Very good Steel 34mm Automatic
TOP
Rolex Men's Oyster Perpetual Date 1500 Automatic, c.1974 Swiss...
3 252 
Free shipping
Verified Dealer
640
US
Omega Seamaster Aqua Terra 2513.30.00 Very good Steel Automatic Finland, Helsinki
Omega Seamaster Seamaster NLZ-32 Chronograph
3 490 
Verified Dealer
19
FI
Rolex GMT-Master 16700 Very good Steel 40,00mm Automatic
TOP
Rolex GMT-Master 16700 Ser. T - 1997 - Box & Papers
10 300 
Verified Dealer
106
IT
Rolex Lady-Datejust 178343 Very good Gold/Steel 31mm Automatic
TOP
Rolex Datejust 31mm Medium 178343 Stahl Gelbgold 750 Stainless...
8 490 
Verified Dealer
601
DE
Omega Seamaster Planet Ocean Chronograph 232.30.46.51.01.001 Very good Steel 45mm Automatic
TOP
Omega 232.30.46.51.01.001
3 920 
Verified Dealer
67
JP
Breitling AB01192A1L1X2 New Steel 43mm Automatic
TOP
Breitling Aviator 8 B01 Chronograph Curtiss Warhawk
5 395 
Verified Dealer
244
DE
Omega Seamaster 300 233.32.41.21.01.001 Very good Steel 41mm Automatic
TOP
Omega Seamaster 300 Spectre Limited Edition 233.32.41.21.01.001
7 230 
Verified Dealer
51
JP
Rolex GMT-Master II 16710 Very good Steel 40mm Automatic
TOP
Rolex GMT-Master II 16710 U-Serie „Swiss only“ Rolex Service 2020
10 990 
Verified Dealer
154
DE
Breitling Navitimer World A24322 Very good Steel 46mm Automatic
TOP
Breitling Navitimer World Gmt Chronograph Automatik Herrenuhr...
3 360 
Verified Dealer
2494
DE
Rolex Oyster Perpetual Date Very good Steel 35mm Automatic
TOP
Rolex Men's Rolex Oyster Perpetual Date ref.1501 Automatic,...
3 405 
Free shipping
Verified Dealer
640
US
Omega De Ville Hour Vision 431.63.41.22.13.001 Very good Rose gold 41mm Automatic Finland, Helsinki
Omega De Ville Hour Vision Annual Calendar Red Gold
13 900 
Verified Dealer
19
FI
Zenith Very good Steel 43mm Chronograph
TOP
Zenith A. Cairelli Tipo CP-2 Never Polished
12 900 
Verified Dealer
115
IT
Rolex Lady-Datejust Very good Gold/Steel 26mm Automatic
TOP
Rolex Lady Datejust Stahl Gold 750 Diamanten Automatik...
3 490 
Verified Dealer
601
DE
Omega Seamaster Aqua Terra 231.53.44.50.01.001 Good White gold 42mm Automatic
TOP
Omega 231.53.44.50.01.001
7 817 
Verified Dealer
67
JP
Omega Seamaster Aqua Terra 220.10.38.20.01.001 New Steel 38mm Automatic
TOP
Omega Seamaster Aqua Terra 150 M, 38 mm B&P
4 195 
Verified Dealer
244
DE
Omega Seamaster Aqua Terra 231.10.42.21.03.003 Very good Steel 41.5mm Automatic
TOP
Omega Seamaster Aqua Terra Co-Axial Blue Dial 231.10.42.21.03...
2 543 
Verified Dealer
51
JP
Sinn 103 103.0619 New Steel 41mm Automatic
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
2 450 
Verified Dealer
94
DE
Breitling Bentley 6.75 A44362 Very good Steel 48.5mm Automatic
TOP
Breitling For Bentley 6,75 Chronograph Automatik Herrenuhr...
3 360 
Verified Dealer
2494
DE
Rolex Oyster Perpetual Date Very good Steel 35mm Automatic
TOP
Rolex Men's Rolex ref.1501 Oyster Perpetual Automatic w/Date,...
3 216 
Free shipping
Verified Dealer
640
US
Rolex Datejust II 116300 Very good Steel 41mm Automatic
TOP
Rolex DATEJUST II Rainbow Pave Dial + Baguette Lünette B + P LCEU
12 086 
Verified Dealer
139
DE
Chopard Mille Miglia 168514-3001 Very good Steel 44mm Automatic
TOP
Chopard Mille Miglia Gran Turismo XL GMT
4 200 
Verified Dealer
14
LV
Eberhard & Co. Tazio Nuvolari Eberhard & Co Tazio Nuvolari 31030 Movimento Gravè Oro New Steel 39.5mm Automatic
TOP
Eberhard & Co. [Rare] Tazio Nuvolari Gold Movement
12 000 
Verified Dealer
 
IT
Breitling Chronomat 44 CB011012/C790/375C Very good Gold/Steel 44mm Automatic Finland, HELSINKI
Breitling Chronomat 44
7 100 
Private Seller
 
FI
Breitling Avenger Blackbird V17310101B1W1 New Titanium 48mm Automatic
TOP
Breitling Avenger Blackbird 48mm Titan Volcano Black
3 695 
Verified Dealer
244
DE
Omega Constellation Ladies 123.10.35.20.01.002 Very good Steel 35mm Automatic
TOP
Omega Constellation Co-Axial Automatic 35mm 123.10.35.20.01.002
1 568 
Verified Dealer
51
JP
Omega Constellation 315.164 (2943, 2954 SC) Good Yellow gold 36mm Automatic
TOP
Omega Constellation Chronometer Calendar 18K Vintage
1 967 
Verified Dealer
327
DE
Breitling Chronomat 44 AB0115 Very good Steel 44mm Automatic
TOP
Breitling Chronomat 44 Chronograph Automatik Stahl Herrenuhr...
3 480 
Verified Dealer
2494
DE
Rolex Oyster Perpetual Very good Gold/Steel 35mm Automatic
TOP
Rolex Men's Rolex 18K & SS Oyster Perpetual ref.1005 Automatic...
4 540 
Free shipping
Verified Dealer
640
US
Rolex Datejust 126300 Unworn Steel 41mm Automatic
TOP
Rolex DATEJUST 41 Rainbow Pave Dial + Baguette Lünette
12 987 
Verified Dealer
139
DE
Breitling Navitimer D23322 Very good Gold/Steel 42mm Automatic
TOP
Breitling Navitimer D23322 Revisioniert
5 950 
Verified Dealer
106
DE
Zenith El Primero Stratos Spindrift 75.2060.4061/21.R573 Very good Steel 45mm Automatic Finland, Imatra
Zenith El Primero Stratos Spindrift
4 950 
Verified Dealer
17
FI
Omega Constellation 168.0056 Good Steel 35mm Automatic Finland, Helsinki
Omega Constellation C Date
950 
Verified Dealer
17
FI
Breitling Transocean Chronograph AB0152121B1S1 New Steel 43mm Automatic
TOP
Breitling Transocean Chronograph B&P Neuware
5 595 
Verified Dealer
244
DE
Omega Seamaster Railmaster 2803.52.37 Fair Steel 39,2mm Automatic Finland, Askola
Omega Seamaster Railmaster
2 789 
Private Seller
 
FI
Breitling Chronomat 41 AB014012/F55 Unworn Steel 41mm Automatic
TOP
Breitling Chronomat 41 AB014012/F55
5 395 
Verified Dealer
327
DE
Breitling Navitimer World A24322 Very good Steel 46mm Automatic
TOP
Breitling Breilting Navitimer World Gmt Chronograph Automatik...
3 960 
Verified Dealer
2494
DE
Rolex Oyster Perpetual Very good Gold/Steel 35mm Automatic
TOP
Rolex Men's Rolex ref.1005 18K Gold & SS Oyster Perpetual...
4 540 
Free shipping
Verified Dealer
640
US
Rolex Datejust 1601 Good Steel 36mm Automatic
TOP
Rolex Datejust
3 310 
Verified Dealer
37
JP
Omega Speedmaster Professional Moonwatch 311.33.44.51.01.001 Very good Steel 44.25mm Automatic
TOP
Omega Speedmaster Professional Moonwatch 44.25 Co-Axial Automatic
3 999 
Verified Dealer
109
BG
Blancpain Fifty Fathoms Bathyscaphe 5052-1110-63A Very good Steel 43mm Automatic Finland, Imatra
Blancpain Fifty Fathoms Bathyscaphe Jour Date 70s LTD
8 890 
Verified Dealer
17
FI
Rolex Sea-Dweller Deepsea 116660 Very good Steel 44mm Automatic
TOP
Rolex Deepsea SUGAR ICE B+P Diamomnds LC100 Sea-Dweller
16 297 
Verified Dealer
139
DE
Breitling A24322121B2X1 New Steel 46mm Automatic
TOP
Breitling Navitimer 1 GMT Chronograph 46 Full Set
4 595 
Verified Dealer
244
DE
Breitling Navitimer World A24322 Very good Steel 46mm Automatic
TOP
Breitling Navitimer World Revisioniert
5 250 
Verified Dealer
106
DE
Ebel 1911 BTR 9137L72/5335145YS Very good Steel 45mm Automatic
TOP
Ebel BTR Chrono Automatik Ref. 9137L72/5335145YS
2 785 
Verified Dealer
327
DE
Omega Seamaster Aqua Terra 231.92.39.21.04.001 Very good Titanium 38.5mm Automatic
TOP
Omega Seamaster Aqua Terra Goodplanet Co-axial 231.92.39.21.04...
4 060 
Verified Dealer
2494
DE
Rolex Lady-Datejust Very good 25mm Automatic
TOP
Rolex Ladies 18k Solid Gold Oyster Datejust 6917 Automatic...
3 216 
Free shipping
Verified Dealer
640
US
Omega Seamaster Diver 300 M 210.92.42.20.01.001 New Titanium 42mm Automatic
TOP
Omega Seamaster Diver 300 M 007 Edition "No Time To Die" NEW 2020
7 800 
Verified Dealer
IT
Breitling Chronomat 44 CB011012 Very good Gold/Steel 44mm Automatic
TOP
Breitling Yellow Gold 18Kt Chronograph Chrono Chronomat 44 mm
5 195 
Verified Dealer
519
ES
Tudor Prince Date 79260 Very good Steel 40mm Automatic Finland, Imatra
Tudor Prince Date Chronograph
4 190 
Verified Dealer
17
FI
Rolex Milgauss 116400GV Very good Steel 40mm Automatic
TOP
Rolex Milgauss Z-Blue - Freshly polished, ticking perfectly
7 299 
Verified Dealer
109
BG
Breitling Superocean 44 M1739313/BE92/153S New Steel 44mm Automatic
TOP
Breitling Superocean 44 Special Black PVD
3 950 
Verified Dealer
244
DE
Omega Constellation 168017 Very good Gold/Steel 35mm Automatic Finland, Helsinki
Omega Automatic Chronometer Constellation (CD 168017 SP) + Box...
1 590 
Private Seller
 
FI
Breitling Superocean Chronograph II A13341A8/BA81 Good Steel 44mm Automatic
TOP
Breitling Superocean Chrono A13341A8/BA81 Abyss rot
3 229 
Verified Dealer
327
DE
Omega De Ville Hour Vision 433.13.41.21.02.001 Very good Steel 36mm Automatic
TOP
Omega De Ville Hour Vision Automatik Co-axial 433.13.41.21.02.001
3 760 
Verified Dealer
2494
DE
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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.