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Rolex Datejust Oysterquartz 17013 Very good Steel 36mm Quartz
TOP
Rolex Oysterquartz Datejust 17013 18k Solid Yellow Gold & SS...
4 723 
Professional dealer
61
US
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic
TOP
Rolex Sea-Dweller Red Writing 43mm Steel 126600
14 861 
Free shipping
Professional dealer
770
UK
Rolex Submariner (No Date) 124060 New Steel 41mm Automatic
TOP
Rolex NEW 03/2021 - Submariner No Date 124060
12 490 
Professional dealer
34
FR
Rolex Sea-Dweller 126600 Very good Steel 43mm Automatic
TOP
Rolex Sea-Dweller Céramique Red
14 000 
Professional dealer
247
FR
Omega Speedmaster '57 331.10.42.51.01.001 Very good Steel 41.5mm Automatic
TOP
Omega Speedmaster '57 Chronograph Automatik Ref. 331.10.42.51....
4 850 

Sold by Chrono24

DE
TAG Heuer Carrera CAR5A90.FC6415 New Ceramic 45mm Automatic Finland, Helsinki
TAG Heuer Carrera Tourbillon Chronograph Ceramic
12 450 
Professional dealer
39
FI
Omega Constellation 168.005 Fair Gold/Steel 34.0mm Automatic
TOP
Omega Constellation Cal. 564
1 381 
Professional dealer
9
US
Rolex Datejust 126334 Very good Gold/Steel 41mm Automatic
TOP
Rolex Datejust 41 Stahl / Weissgold Diamanten Oyster Perpetual...
11 450 
Professional dealer
4500
DE
Breitling Avenger A32397101B1A1 New Steel 43mm Automatic
TOP
Breitling Avenger Automatic Gmt 43 Black
3 350 
Professional dealer
411
DE
Rolex Daytona 16518 Good Yellow gold 40mm Automatic
TOP
Rolex Daytona
22 700 
Free shipping
Professional dealer
89
ES
Omega Globemaster 130.33.41.22.06.001 Very good Steel 41mm Automatic
TOP
Omega Constellation Globemaster 41 Annual Calendar Master...
5 199 
Professional dealer
240
BG
Concord C1 C1-GXX-18R Very good Rose gold 44mm Automatic
TOP
Concord C1 Chrono in 18K Rosegold + Carbon Fiber Zifferblatt ...
18 729 
Professional dealer
213
DE
Ball DG3030B-S3CJ-BK New Titanium 40mm Automatic
TOP
Ball Roadmaster Marine GMT Ceramic Brown
2 242 
Free shipping
Professional dealer
135
JP
Omega Seamaster Diver 300 M 212.30.44.50.01.001 Very good Steel 44mm Automatic
TOP
Omega Seamaster Diver 300M Co-Axial Chronograph 212.30.44.50.0...
4 150 

Sold by Chrono24

DE
Audemars Piguet Royal Oak Offshore Chronograph 26170ST.OO.D091CR.01 Very good Steel 42mm Automatic Finland, Imatra
Audemars Piguet Royal Oak Offshore Safari
17 700 
Professional dealer
45
FI
Breitling Bentley Motors A25362 Very good Steel 49mm Automatic
TOP
Breitling Bentley Motors
4 250 
Professional dealer
1965
ES
Omega Seamaster Aqua Terra 2512.50.00 Very good Steel 42mm Automatic
TOP
Omega Seamaster Aqua Terra Chronograph Automatik Stahl Ref....
3 250 
Professional dealer
4500
DE
TAG Heuer Autavia WBE5191.FC8276 New Bronze 42mm Automatic
TOP
TAG Heuer Autavia Bronze Brown Chronometer 42mm
2 690 
Professional dealer
411
DE
Cartier Pasha Very good Yellow gold 42mm Automatic
TOP
Cartier Pasha Chronometer Gold 3027
18 200 
Free shipping
Professional dealer
89
ES
Seiko 4502-8010 Good Steel 37mm Manual winding
TOP
Seiko 45KS "SUPERIOR Chronometer" KING SEIKO with HIRSCH
696 
Professional dealer
152
JP
Rolex Day-Date Oysterquartz 19048 Very good Yellow gold 36mm Quartz
TOP
Rolex Day-Date Oysterquartz Diamond Dial LC100 MINT CONDITION...
29 852 
Professional dealer
213
DE
Ball Engineer Hydrocarbon Nedu DC3026A-S3CJ-BE New Titanium 42mm Automatic
TOP
Ball Engineer Hydrocarbon NEDU
3 479 
Free shipping
Professional dealer
135
JP
Ulysse Nardin Maxi Marine Diver 265-90 Very good Gold/Steel 45mm Automatic
TOP
Ulysse Nardin Marine Chronometer Stahl / Gold Automatik Ref....
6 950 

Sold by Chrono24

DE
Jaeger-LeCoultre Master Compressor Diving Chronograph Q186T670 Very good Titanium 44mm Automatic Finland, Imatra
Jaeger-LeCoultre Master Compressor Diving Chronograph
6 990 
Professional dealer
45
FI
TAG Heuer Grand Carrera CAV5185.FT6020 Very good Titanium 43mm Automatic
TOP
TAG Heuer Grand Carrera 43MM. Top Condition CAV5165 - CAV5185....
3 850 
Free shipping
Professional dealer
943
NL
Omega Seamaster Railmaster 220.10.40.20.01.001 Very good Steel 40mm Automatic
TOP
Omega Seamaster Railmaster Automatik Herrenuhr 220.10.40.20.01...
4 050 
Professional dealer
4500
DE
Breitling Superocean V17369241L1S2 New Titanium 48mm Automatic
TOP
Breitling Superocean Automatic 48 Titan /DLC Green
4 550 
Professional dealer
411
DE
Girard Perregaux WW.TC 4980 Very good Yellow gold 43mm Automatic
TOP
Girard Perregaux Ww.tc World Chronograph
9 400 
Free shipping
Professional dealer
89
ES
Rolex GMT-Master 1675 Good Steel 40mm Automatic
TOP
Rolex 1675 GMT-Master MKI Long E in mint condition from 1967
17 200 
Professional dealer
34
NL
Omega Constellation 167.005 Very good Gold/Steel 34mm Automatic
TOP
Omega Constellation Pie Pan Certified Chronometer 14K & SS...
1 431 
Professional dealer
61
US
Ball Engineer Hydrocarbon DM2276A-S3CJ-BK New Steel 42mm Automatic
TOP
Ball Engineer Hydrocarbon Submarine Warfare Blue PVD
2 164 
Free shipping
Professional dealer
135
JP
Breitling Navitimer AB0123 Very good Steel 42.5mm Automatic
TOP
Breitling Navitimer Limited Edition Chronograph Automatik Ref....
6 030 

Sold by Chrono24

DE
IWC Ingenieur Chronograph Racer IW378509 Good Steel 45mm Automatic Finland, Imatra
IWC Ingenieur Chronograph Racer Flyback SERVICED 2014
6 590 
Professional dealer
45
FI
Chopard Mille Miglia 168459-3037 Very good Steel 44mm Automatic
TOP
Chopard First Price' Limited Edition 50 pieces - Historic...
9 950 
Free shipping
Professional dealer
943
NL
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic
TOP
Rolex Sea Dweller Red Automatik Edelstahl Herrenuhr Ref....
14 450 
Professional dealer
4500
DE
Omega Seamaster Planet Ocean Chronograph 215.92.46.51.01.001 New Ceramic 45.5mm Automatic Finland, Jyväskylä
Omega Seamaster Planet Ocean
8 990 
Professional dealer
20
FI
Ulysse Nardin 573-22 Very good Steel 40mm Automatic
TOP
Ulysse Nardin Berlin Chronograph Split Second COSC Ref. 573-22
3 500 
Free shipping
Professional dealer
22
IT
Rolex Bubble Back flat-back bubbleback oyster artdeco pow Good Yellow gold 32,5mm Manual winding
TOP
Rolex Super rare ( POW ) 9k gold Oyster Flat-Back from 1934
7 850 
Professional dealer
34
NL
Ball Engineer Hydrocarbon DM2118B-S2CJ-BK New Steel 40mm Automatic
TOP
Ball Engineer Hydrocarbon Original (40mm)
2 280 
Free shipping
Professional dealer
135
JP
Omega De Ville Hour Vision 431.33.41.21.02.001 Very good Steel 41mm Automatic
TOP
Omega De Ville Hour Vision Co-Axial Automatik Herrenuhr Ref....
4 250 

Sold by Chrono24

DE
Rolex Datejust 126234 Very good Steel 36mm Automatic Finland, Imatra
Rolex Datejust 36 Blue
8 890 
Professional dealer
45
FI
Omega Seamaster Planet Ocean 2200.51.00 Good Steel 45,5mm Automatic Finland, Porvoo
Omega Seamaster Planet Ocean
2 860 
Professional dealer
33
FI
Paul Picot Firshire 0740 Very good Steel 48.5mm Automatic
TOP
Paul Picot Firshire 3000 Chronometer Automatik Edelstahl...
2 350 
Professional dealer
4500
DE
Omega Speedmaster Professional Moonwatch 311.92.44.51.01.003 Very good Ceramic Automatic Finland, Jyväskylä
Omega Dark Side Of The Moon Speedmaster
7 450 
Professional dealer
20
FI
Breitling Chronomat 44 AB011010/BB08 Very good Steel 44mm Automatic
TOP
Breitling flying fish series, CHRONOMAT 44MM, AUTOMATIC, REF...
4 350 
Free shipping
Professional dealer
943
NL
Heuer CR2110 Very good Steel Automatic Finland, helsinki
Heuer Monza
2 300 
Private Seller
 
FI
Breitling Superocean II 42 A17365 Good Steel 42mm Automatic
TOP
Breitling Super Ocean Ⅱ 42 Blue Dial A17365 Automatic SuperOce...
1 662 
Professional dealer
175
JP
Ball Engineer Hydrocarbon Nedu DC3026A-SCJ-BK New Titanium 42mm Automatic
TOP
Ball Engineer Hydrocarbon NEDU
3 479 
Free shipping
Professional dealer
135
JP
Omega De Ville Prestige 424.10.40.20.02.004 Very good Steel 39.5mm Automatic
TOP
Omega De Ville Prestige Automatik Herrenuhr Ref. 424.10.40.20....
2 890 

Sold by Chrono24

DE
Jaeger-LeCoultre Master Compressor Diving Chronograph 160.T.25 Very good Titanium 44mm Automatic Finland, Imatra
Jaeger-LeCoultre Master Compressor Diving Chronograph
6 990 
Professional dealer
45
FI
Omega De Ville Prestige 424.13.40.20.02.002 Unworn Steel 39.5mm Automatic Finland, Porvoo
Omega De Ville Prestige
2 440 
Professional dealer
33
FI
Omega Seamaster Railmaster 220.10.40.20.03.001 Very good Steel 40mm Automatic
TOP
Omega Seamaster Railmaster Co-Axial Herrenuhr 220.10.40.20.03....
3 850 
Professional dealer
4500
DE
Omega Speedmaster '57 331.20.42.51.01.002 New Gold/Steel 41.5mm Automatic Finland, Jyväskylä
Omega Speedmaster '57
10 700 
Professional dealer
20
FI
Zenith 96.2062.405/27.C707 Very good Palladium 45.5mm Automatic
TOP
Zenith Stratos Pole2Pole Fly-back Palladium' Coated SS -...
4 695 
Free shipping
Professional dealer
943
NL
Omega Seamaster Planet Ocean Chronograph 2210.50.00 Good Steel 45.5mm Automatic Finland, Tampere
Omega Seamaster Planet Ocean Chronograph
3 390 
Private Seller
 
FI
Breitling Superocean 42 A173643B/C868 Very good Steel 42mm Automatic
TOP
Breitling Superocean 42
3 150 
Free shipping
Professional dealer
221
ES
Ball Engineer Hydrocarbon Spacemaster DM2036A-SCAJ-WH New Steel 41.5mm Automatic
TOP
Ball Engineer Hydrocarbon Spacemaster
2 180 
Free shipping
Professional dealer
135
JP
Rolex Submariner (No Date) 124060 Unworn Steel 41mm Automatic
Rolex Submariner No Date 41 Automatik Herrenuhr Ref. 124060...
12 410 

Sold by Chrono24

DE
Omega Seamaster Diver 300 M 210.92.42.20.01.001 Unworn Titanium 42mm Automatic
TOP
Omega Seamaster Diver 300M 007 Co‑Axial Master Chronometer 42mm
8 259 
Professional dealer
5491
IT
Omega Constellation OMEGA Constellation CD168.017 Chronometer Very good Steel 40mm Automatic
TOP
Omega Constellation
1 203 
Professional dealer
 
US
Omega Seamaster Planet Ocean 232.32.44.22.03.001 Very good Steel 43.5mm Automatic
TOP
Omega Seamaster Planet Ocean GMT Automatik Ref. 232.32.44.22.0...
4 750 
Professional dealer
4500
DE
Breitling Avenger V32395101B1X1 Unworn Titanium 45mm Automatic Finland, Jyväskylä
Breitling Avenger Automatic Gmt 45 Night Mission
3 500 
Professional dealer
20
FI
Omega Seamaster Planet Ocean Chronograph 232.32.46.51.01.001 Very good Steel 45.5mm Automatic
TOP
Omega Planet Ocean Deep Sea Diver Orange'' Exhibition Co-Axial...
5 295 
Free shipping
Professional dealer
NL

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.