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Rolex Datejust Oysterquartz 17013 Very good Steel 36mm Quartz
TOP
Rolex Oysterquartz Datejust 17013 18k Solid Yellow Gold & SS...
6 093 
Professional dealer
65
US
Fortis 607.22.170 Very good Steel 39mm Automatic
TOP
Fortis Chronograph Cosmonauts Alarm
4 500 
Free shipping
Professional dealer
234
ES
Rolex Sea-Dweller 126600 Unworn Steel 43mm Automatic
TOP
Rolex Sea-Dweller Red 126600 43mm Steel 02/2021
14 500 
Free shipping
Professional dealer
145
AT
Chopard Mille Miglia 8459 Very good Steel 44mm Automatic
TOP
Chopard Mille Miglia Gt Xl Excellent Condition New Original Strep
4 000 
Professional dealer
474
ES
Omega Speedmaster Professional Moonwatch 31032425001001 Unworn Steel 42mm Manual winding
TOP
Omega Speedmaster Moonwatch Double Sapphire 42mm NEW 2020 With...
6 300 
Professional dealer
155
IT
Rolex Submariner Date 116610LV Very good Steel 40mm Automatic
TOP
Rolex Submariner Date 116610LV „HULK“ B+P FULLSET
18 990 
Free shipping
Professional dealer
201
DE
Rolex GMT-Master II 116710LN Unworn Steel 40mm Automatic
TOP
Rolex GMT-Master BATMAN ICE Baguette Diamonds Iced OUT Fully...
23 930 
Professional dealer
221
DE
Rolex Day-Date 1803 Big Logo Clasp Very good Yellow gold 36mm Automatic
TOP
Rolex Day Date President Automatic 18K Gold Herrenuhr Big Logo
11 990 
Professional dealer
689
DE
Rolex Datejust 126334 Unworn White gold 41mm Automatic
TOP
Rolex Datejust 41 126334 Black Jubilee
11 400 
Professional dealer
162
ES
Omega Speedmaster Ladies Chronograph 324.30.38.40.06.001 Good Steel 38mm Automatic Finland, Oulu
Omega Speedmaster Chronograph
2 990 
Professional dealer
22
FI
Ulysse Nardin Marine Chronometer Manufacture 1183-126-3/43 New Steel 43mm Automatic
TOP
Ulysse Nardin Marine Chronometer Manufacture 43mm - Top
7 149 
Professional dealer
699
DE
Rolex Submariner Date 16610T Very good Steel 40mm Automatic
Rolex Submariner Date Automatik Edelstahl Herrenuhr Oyster...
8 850 

Sold by Chrono24

DE
Panerai PAM 01024 Very good Steel 44mm Automatic Finland, Imatra
Panerai Luminor Submersible Base PAM01024
5 990 
Professional dealer
47
FI
Ball Engineer Hydrocarbon DM2276A-S3CJ-BK New Steel 42mm Automatic
TOP
Ball Engineer Hydrocarbon Submarine Warfare Blue PVD
2 206 
Free shipping
Professional dealer
151
JP
Rolex GMT-Master II 16710 Very good Steel 40mm Automatic
TOP
Rolex GMT-Master II 16710 F-Serie B+P FULLSET Rolex Service 2020
15 490 
Free shipping
Professional dealer
201
DE
Rolex Submariner Date 116610LN Unworn Steel 40mm Automatic
TOP
Rolex Submariner Diamonds Pave Dial Baguette Bezel Custom like...
25 991 
Professional dealer
221
DE
Ulysse Nardin Marine Chronometer 43mm 266-67/40 Unworn Red gold 43mm Automatic
TOP
Ulysse Nardin Marine Chronometer 18K (0,750) Roségold Automati...
9 850 
Professional dealer
4760
DE
Omega Seamaster Diver 300 M 212.30.41.20.03.001 Very good Steel 41mm Automatic Finland, Porvoo
Omega Seamaster Diver
3 200 
Professional dealer
55
FI
Heuer CR2110 Very good Steel Automatic Finland, helsinki
Heuer Monza
2 300 
Private Seller
FI
Omega Seamaster Diver 300 M 210.30.42.20.01.002 Very good Steel 42mm Automatic
TOP
Omega Nekton Edition Seamaster Diver 300 M Co-axial Master...
3 963 
Professional dealer
197
JP
Breitling Bentley Motors A25362 Very good Steel 49mm Automatic
Breitling Bentley Motors Chronograph Stahl Herrenuhr Ref....
5 350 

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
47
FI
Ball Engineer Hydrocarbon Deepquest DM3002A-SC-WH New Titanium 42mm Automatic
TOP
Ball Engineer Hydrocarbon DeepQUEST II
2 994 
Free shipping
Professional dealer
151
JP
Rolex Submariner Date 16613 Very good Gold/Steel 40mm Automatic
TOP
Rolex Submariner Date 16613 S-Serie Rolex Service 2021
11 190 
Free shipping
Professional dealer
201
DE
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
221
DE
Ulysse Nardin Marine Chronometer Manufacture 1183-126 Very good Steel 43mm Automatic
TOP
Ulysse Nardin Marine Chronometer Automatik Stahl Ref. 1183-126...
6 150 
Professional dealer
4760
DE
Omega Seamaster 300 233.30.41.21.01.001 Very good Steel 41mm Automatic Finland, Porvoo
Omega Seamaster 300
4 600 
Professional dealer
55
FI
Breitling Chronomat 44 IB011012/B957 Very good Steel 43,5mm Automatic Finland, Tampere
Breitling Chronomat 44 (Serviced 2021)
4 990 
Private Seller
 
FI
Breitling Superocean II 44 A17392D7/BD68/162A Good Steel 44mm Automatic
TOP
Breitling Super Ocean Ⅱ 44 Black Dial A17392 Automatic...
2 048 
Professional dealer
197
JP
Rolex Submariner Date 126610LN Unworn Steel 41mm Automatic
Rolex Submariner Automatik Edelstahl Herrenuhr Oyster Ref....
13 950 

Sold by Chrono24

DE
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
47
FI
Breitling Superocean II 44 A17392 Very good Steel 44mm Automatic
TOP
Breitling Superocean II 44 A17392 / BOX & PAPERS / 2017 / Blue...
3 295 
Free shipping
Professional dealer
227
NL
Rolex GMT-Master II 16710 Very good Steel 40mm Automatic
TOP
Rolex GMT-Master II 16710 Y-Serie Rolex Service 2021
13 190 
Free shipping
Professional dealer
201
DE
Rolex GMT-Master II 116710LN Unworn Steel 40mm Automatic
TOP
Rolex GMT-Master ICE Baguette Diamonds Iced OUT Fully Loaded
24 920 
Professional dealer
DE
Ulysse Nardin Marine 1182-160/490 Unworn Red gold 39mm Automatic
TOP
Ulysse Nardin Marine Lady Chronometer 18K Roségold Ref....
13 550 
Professional dealer
4760
DE
Breitling Montbrillant Légende C23340 Good Gold/Steel 47mm Automatic Finland, Porvoo
Breitling Montbrillant Legende
6 200 
Professional dealer
55
FI
Breitling Superocean Heritage 42 A17321 Very good Steel 42mm Automatic Finland, Helsinki
Breitling Superocean Heritage 42
2 400 
Private Seller
 
FI
Maurice Lacroix AIKON AI1018-SS001-333-1 New Steel 44mm Quartz
TOP
Maurice Lacroix Aikon Cronograph
830 
Professional dealer
74
ES
Omega Seamaster 300 233.30.41.21.01.001 Very good Steel 41mm Automatic
Omega Seamaster 300 Master Co-Axial Ref. 233.30.41.21.01.001 B&P
4 450 

Sold by Chrono24

DE
Panerai Luminor Marina PAM 00631 Good Steel 44mm Manual winding Finland, Imatra
Panerai Luminor Marina Base Logo 2016
4 790 
Professional dealer
47
FI
Omega Speedmaster Broad Arrow 321.10.42.50.01.001 Very good Steel 42mm Automatic
TOP
Omega Speedmaster Broad Arrow 1957 321.10.42.50.01.001 / BOX &...
4 795 
Free shipping
Professional dealer
227
NL
Rolex GMT-Master II 16713 Very good Gold/Steel 40mm Automatic
TOP
Rolex GMT-Master II 16713 „Tiger Eye“ D-Serie B+P FULLSET...
17 690 
Free shipping
Professional dealer
201
DE
Rolex Yacht-Master 16628 Very good Yellow gold 40mm Automatic
TOP
Rolex Yacht-Master Vintage LC100 Mint Condition Never Polished...
28 989 
Professional dealer
221
DE
Ulysse Nardin 276-88 Very good Yellow gold 40mm Automatic
TOP
Ulysse Nardin Ulysse 1 Chronometer 18K Gold Automatik Herrenuh...
5 650 
Professional dealer
4760
DE
TAG Heuer Carrera CAR5A90.FC6415 New Ceramic 45mm Automatic Finland, Helsinki
TAG Heuer Carrera Tourbillon Chronograph Ceramic
12 450 
Professional dealer
40
FI
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
Maurice Lacroix AIKON ai6038-ss001-133-4 New Steel 44mm Automatic
TOP
Maurice Lacroix AIKON Automatic Chronograph Edición Especial...
2 450 
Professional dealer
74
ES
Vacheron Constantin Overseas 42050-72050/1 Very good Steel 35mm Automatic
Vacheron Constantin Overseas Chronometer Automatik Herrenuhr...
8 450 

Sold by Chrono24

DE
TAG Heuer Carrera Calibre 1887 car2111.ba0720 Very good Steel 41mm Automatic Finland, Imatra
TAG Heuer Carrera 1887 Chronograph SERVICED IN 2017
2 690 
Professional dealer
47
FI
Chopard Mille Miglia 16/8459 Good Steel 44mm Automatic
TOP
Chopard Mille Miglia GT XL Automatic Chronograph 8459
2 961 
Professional dealer
264
US
Rolex Submariner Date 16613 Very good Gold/Steel 40mm Automatic
TOP
Rolex Submariner Date 16613 M-Serie B+P FULLSET
12 690 
Free shipping
Professional dealer
201
DE
Omega Constellation 168.005 Fair Gold/Steel 34.0mm Automatic
TOP
Omega Constellation Cal. 564
1 425 
Professional dealer
16
US
Ulysse Nardin 8003-102 Very good Steel 43mm Automatic
TOP
Ulysse Nardin Marine Diver Chronometer Automatik Stahl...
4 450 
Professional dealer
4760
DE
Omega Seamaster Diver 300 M 213.30.42.40.01.001 Good Steel 41,5mm Automatic Finland, Tampere
Omega Seamaster Diver 300 M
2 990 
Private Seller
 
FI
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 
Free shipping
Professional dealer
5745
IT
Ulysse Nardin Marine 263-22 Very good Steel 38mm Automatic
Ulysse Nardin Marine Chronometer Automatik Edelstahl Herrenuhr...
3 250 

Sold by Chrono24

DE
Rolex Day-Date Very good White gold 36mm Automatic
TOP
Rolex Oyster Perpetual Day-Date 18039 / 18K Weissgold Brillant...
18 490 
Professional dealer
1383
DE
Frederique Constant FC-303N4NH6B New Steel 41mm Automatic
TOP
Frederique Constant Cosc Highlife Automatic COSC 41mm Blue...
1 490 
Free shipping
Professional dealer
1417
IT
Rolex Submariner Date 116610LN Very good Steel 40mm Automatic
TOP
Rolex Submariner Date 116610LN G-Serie "116619LB LOOK" B+P...
14 490 
Free shipping
Professional dealer
201
DE
Omega Constellation 14393 61 SC Good Steel 34.5mm Automatic
TOP
Omega Constellation "Pie Pan Dial" with HIRSCH
1 969 
Professional dealer
160
JP
Chopard Grand Prix de Monaco Historique 168992 Very good Titanium 42mm Automatic
TOP
Chopard Classic Racing Grand Prix de Monaco Historique Ref....
4 060 
Professional dealer
4760
DE
Omega Speedmaster Date 323.10.40.40.02.001 Good Steel 40mm Automatic
TOP
Omega Speedmaster Automatic Stainless Steel Men's Sports Watch...
2 443 
Free shipping
Professional dealer
1082
JP
Breitling Avenger II GMT A3239011/G778 Very good Steel Automatic Finland, Pankakoski
Breitling Avenger II GMT Mint Breitling looking for a new home
2 200 
Private Seller
 
FI

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.