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Omega Globemaster 130.20.39.21.02.001 Very good Gold/Steel 39mm Automatic
TOP
Omega 2020 Constellation Globemaster, 13020392102001, Steel &...
8 000
Professional dealer
306
UK
Omega De Ville Co-Axial 168.1704 Very good Steel 39mm Automatic
TOP
Omega De Ville Chronometer Co-Axial Automatik Stahl Herrenuhr...
2 450
Professional dealer
5017
DE
Omega Seamaster Planet Ocean 522.32.40.20.01.001 Very good Steel 39.5mm Automatic
TOP
Omega Olympic Seamaster Olympic 522.32.40.20.01.001
4 100
Professional dealer
743
PL
Omega De Ville Prestige 424.13.40.21.01.001 Unworn Steel 39.5mm Automatic
TOP
Omega De Ville Prestige Co-Axial Automatik Herrenuhr Ref....
3 450
Professional dealer
5017
DE
Omega Speedmaster Professional Moonwatch 311.92.44.51.01.006 Unworn Ceramic 44mm Automatic
TOP
Omega Speedmaster Dark Side of the Moon Automatik 311.92.44.51...
9 450
Sold by Chrono24
DE
Rolex Daytona 116500LN New Steel 40mm Automatic
TOP
Rolex Daytona 116500LN new unworn 2021 white dial
36 000
Professional dealer
20
MC
Omega Constellation 168.005 Fair Gold/Steel 34.0mm Automatic
TOP
Omega Constellation Cal. 564
1 443
Professional dealer
22
US
Breitling Navitimer AB01213B1B1A1 New Steel 43mm Automatic
TOP
Breitling NAVITIMER B01 CHRONOGRAPH43 BLACK MOP SPECIAL...
8 800
Free shipping
Professional dealer
165
JP
Omega Speedmaster Professional Moonwatch 310.30.42.50.01.001 Unworn Steel 42mm Manual winding
TOP
Omega Speedmaster Moonwatch Co-Axial Master Chronometer
5 990
Professional dealer
11
IT
Omega Seamaster Diver 300 M 210.30.42.20.03.001 New Steel 42mm Automatic Finland, Jyväskylä
Omega Seamaster Diver 300 M
4 700
Professional dealer
34
FI
Omega Seamaster Aqua Terra 231.15.34.20.55.001 New Steel Automatic
TOP
Omega SEAMASTER AQUA TERRA 150M 231.15.34.20.55.001 NEW MOP DIAL
6 675
Professional dealer
294
IT
Zenith El Primero Chronograph A385 Very good Steel 37mm Automatic
TOP
Zenith El Primero Chronograph Ref AH385 Very Rare Dial Full...
12 500
Professional dealer
176
IT
Omega Speedmaster Racing 326.30.40.50.01.002 Very good Steel 40mm Automatic
TOP
Omega Speedmaster Racing 326.30.40.50.01.002 / BOX & PAPERS...
3 695
Professional dealer
250
NL
Omega De Ville Hour Vision 431.33.41.21.02.001 Very good Steel 41mm Automatic
TOP
Omega De Ville Hour Vision Automatik Co-Axial Ref 431.33.41.21...
3 250
Sold by Chrono24
DE
Rolex Sea-Dweller Deepsea 116660 D New Steel 44mm Automatic
TOP
Rolex Deep Sea 116660 D Blu NOS 2017
18 000
Professional dealer
20
MC
Breitling Transocean Chronograph Unitime AB0510U4/BB62 Good Steel 46mm Automatic Finland, HELSINKI
Breitling Transocean Chronograph Unitime 46mm FULLSET 2013...
4 490
Professional dealer
240
FI
Breitling A007G-1KBA New Steel 42mm Automatic
TOP
Breitling PREMIER B01 CHRONOGRAPH42 See-through back AB0118221...
6 407
Free shipping
Professional dealer
165
JP
Fortis 607.22.170 Very good Steel 39mm Automatic
TOP
Fortis Chronograph Cosmonauts Alarm
4 500
Free shipping
Professional dealer
253
ES
Panerai Luminor Marina PAM 00631 Good Steel 44mm Manual winding Finland, Imatra
Panerai Luminor Marina Base Logo 2016
4 790
Professional dealer
52
FI
Omega Seamaster Planet Ocean 522.32.40.20.01.005 New Steel 39.5mm Automatic
TOP
Omega OLYMPIC OFFICIAL Seamaster Planet Ocean 522.32.40.20.01.005
4 490
Professional dealer
294
IT
Ebel 1911 BTR 1215640 Unworn Rose gold 44.5mm Automatic Finland, Sannainen
Ebel 1911 BTR Rose gold 100 anniversary number 038/100
10 890
Private Seller
 
FI
Omega Speedmaster Racing 326.30.40.50.01.001 Very good Steel 40mm Automatic
TOP
Omega Speedmaster Racing 326.30.40.50.01.001 / BOX & PAPERS...
3 695
Professional dealer
250
NL
Omega Speedmaster Date 3212.80.00 Very good Steel 40mm Automatic
TOP
Omega Speedmaster Date Chronograph Automatik Stahl Herrenuhr...
2 950
Sold by Chrono24
DE
Rolex Submariner Date 16610 Very good Steel 40mm Automatic
TOP
Rolex Submariner 16610 military NATO 1994 S series
35 000
Professional dealer
20
MC
Ulysse Nardin Maxi Marine Diver 263-33 Unworn Steel 42.7mm Automatic
TOP
Ulysse Nardin Maxi Marine Diver
4 800
Professional dealer
23
IT
Breitling Chronomat S001B-RPA New Steel 44mm Automatic
TOP
Breitling CHRONOMAT JSP LIMITED500 ROMAN EDITION See-through...
6 948
Free shipping
Professional dealer
165
JP
Frederique Constant FC-303N4NH6B New Steel 41mm Automatic
TOP
Frederique Constant Cosc Highlife Automatic COSC 41mm Blue...
1 490
Free shipping
Professional dealer
1432
IT
Zenith Pilot Type 20 29.2240.405/18.C801 Very good Bronze 43mm Automatic Finland, Imatra
Zenith Pilot Cronometro Tipo Cp-2 Flyback
4 950
Professional dealer
52
FI
Rolex Oyster Perpetual 14233 Very good Gold/Steel 34mm Automatic
TOP
Rolex Oyster Perpetual Ref. 14233 B & P Year 1998
5 200
Professional dealer
258
IT
850 Fair Steel 38mm Manual winding Finland, TAMPERE
Jardur 850 chronograph
1 200
Private Seller
 
FI
Omega Seamaster Planet Ocean 215.92.46.22.01.003 Very good Ceramic 45.5mm Automatic Finland, Helsinki
Omega Seamaster Planet Ocean Ceramic Deep Red
8 790
Professional dealer
41
FI
Chopard Mille Miglia 8920 Very good Steel 40.5mm Automatic
TOP
Chopard Mille Miglia Chronograph Automatik Edelstahl Herrenuhr...
2 950
Sold by Chrono24
DE
Rolex Submariner Date 16610 COMEX M Very good Steel 40mm Automatic
TOP
Rolex Submariner 16610 COMEX M series full set 2008
89 000
Professional dealer
20
MC
Omega De Ville Prestige 424.10.37.20.04.001 New Steel 36.8mm Automatic
TOP
Omega De Ville Prestige Co-Axial Chronometer White Dial 36.8 mm
2 354
Professional dealer
17
BG

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.