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Rolex Datejust 126334 New White gold 41mm Automatic
TOP
Rolex NEW CARD 2020 - Rolex Datejust 126334 blue dial
11 500 
Professional dealer
24
FR
Rolex Submariner Date 116613LB Unworn Gold/Steel 40mm Automatic
TOP
Rolex Submariner Date Steel & Gold 116613LB
15 548 
Free shipping
Professional dealer
714
UK
Breitling Chronomat Evolution C13356 Very good Gold/Steel 44mm Automatic
TOP
Breitling Chronomat Evolution Factory Diamond Bezel Roman Dial...
7 263 
Free shipping
Professional dealer
464
US
Rolex Daytona 116500LN Unworn Steel 40mm Automatic
TOP
Rolex Daytona Black Steel 116500LN
25 626 
Free shipping
Professional dealer
714
UK
Rolex Day-Date 1803 Big Logo Clasp Very good Yellow gold 36mm Automatic
TOP
Rolex Day Date President Automatic 18K Gold Herrenuhr Big Logo
12 490 
Professional dealer
631
DE
Rolex Datejust II 116300 New Steel 41mm Automatic
TOP
Rolex Datejust II - Rainbow Limited edition /5 Black Venom Dlc...
17 407 
Professional dealer
80
IT
Breitling Navitimer World A24322 Very good Steel 46mm Automatic
TOP
Breitling Navitimer World Revisioniert
5 250 
Professional dealer
128
DE
Breitling Superocean Heritage II Chronographe A13313121B1A1 New Steel 44mm Automatic
TOP
Breitling Superocean Héritage II Chronograph 44 Volcano Schwarz
4 560 
Professional dealer
346
DE
Ball Engineer M NM2032C-S1CJ-BE New Steel 40mm Automatic
TOP
Ball Engineer M Marvelight (40mm) NM2032C-S1CJ-BE
1 875 
Free shipping
Professional dealer
107
JP
Omega Constellation 368.1201 Very good Gold/Steel 35.5mm Automatic
Omega Constellation Stahl / Gold Chronometer Automatik...
2 050 

Sold by Chrono24

DE
Omega Seamaster Diver 300 M 212.30.41.20.03.001 Good Steel 41mm Automatic Finland, Helsinki
Omega Seamaster Diver 300 M
2 890 
Private Seller
 
FI
Breitling Galactic Unitime WB3510U4-BD94-435X New Steel 44mm Automatic
TOP
Breitling Galactic Unitime Men's Watch WB3510U4/BD94-435X
2 684 
Free shipping
Professional dealer
534
US
Breitling Bentley Mark VI P26362 Very good Steel 42mm Automatic
TOP
Breitling Bentley Mark VI Stahl / Platin Chronograph Automatik...
4 950 
Professional dealer
3915
DE
Rolex Datejust 68278 MINT Very good Yellow gold 31mm Automatic
TOP
Rolex Datejust 18K Gold Gelbgold Papiere Automatic Medium Mid...
14 990 
Professional dealer
631
DE
Rolex Yacht-Master 169623 Very good Gold/Steel 29mm Automatic
TOP
Rolex Yacht Master Lady's Boating 18K Sand-blasted bezel -...
4 650 
Free shipping
Professional dealer
860
NL
Rolex GMT-Master II 116710BLNR Very good Steel 40mm Automatic Finland, Imatra
Rolex GMT-Master II "Batman" 2018
15 490 
Professional dealer
39
FI
Breitling Navitimer 8 M13314101B1X1 New Steel 43mm Automatic
TOP
Breitling Navitimer 8 Chronograph 43 Black Steel
4 195 
Professional dealer
346
DE
Ball Engineer II Magneto S NM3022C-N1CJ-BK New Steel 42mm Automatic
TOP
Ball Engineer II Magneto S
2 935 
Free shipping
Professional dealer
107
JP
Omega Seamaster Planet Ocean 232.92.46.21.03.001 Very good Titanium 45.5mm Automatic
Omega Seamaster Planet Ocean Automatik Titan Ref. 232.92.46.21...
4 950 

Sold by Chrono24

DE
Breitling Super Avenger M1337010-B930 Good Steel 48mm Automatic Finland, Siivikkala
Breitling Super Avenger Black steel - Full serviced
3 290 
Private Seller
 
FI
Omega Constellation Constellation Manhattan Very good Steel 35mm Automatic
TOP
Omega Constellation Manhattan Vintage 1985 Auto Chronometer...
1 602 
Professional dealer
55
US
Breitling Bentley Barnato A41390 Very good Steel 42mm Automatic
TOP
Breitling Bentley Barnato 42 Chronograph Automatik Datum...
3 450 
Professional dealer
3915
DE
Omega Constellation 168017 Good Gold/Steel 35mm Automatic
TOP
Omega Constellation C-Shape 168.017 1966
998 
Free shipping
Professional dealer
32
NL
Breitling Chronomat 44 AB011010/BB08 Very good Steel 44mm Automatic
TOP
Breitling Chronomat 44 Flying Fish - 2019/ Breitling Warranty...
4 250 
Free shipping
Professional dealer
860
NL
Rolex Daytona 116520 Very good Steel 40mm Automatic Finland, Imatra
Rolex Cosmograph Daytona "APH" dial COMPLETE
22 700 
Professional dealer
39
FI
TAG Heuer Autavia WBE5116.FC8266 New Steel 42mm Automatic
TOP
TAG Heuer Autavia Calibre 5 Chronometer Blue
2 360 
Professional dealer
346
DE
Ball Engineer Hydrocarbon Deepquest DM3002A-SC-BK New Titanium 42mm Automatic
TOP
Ball Engineer Hydrocarbon DeepQUEST II
2 935 
Free shipping
Professional dealer
107
JP
Omega De Ville Co-Axial 4842.20.32 Very good Steel 41mm Automatic
Omega De Ville St. Moritz Chronograph Automatik Edelstahl...
3 250 

Sold by Chrono24

DE
TAG Heuer Grand Carrera CAV511B.BA0902 Very good Steel 43mm Automatic Finland, Raisio
TAG Heuer Grand Carrera
2 090 
Private Seller
 
FI
Breitling AB0118A61C1P1 New Steel 42mm Automatic
TOP
Breitling Premier B01 Chronograph 42
5 296 
Free shipping
Professional dealer
51
RU
Omega Seamaster Diver 300 M 210.22.42.20.01.004 Unworn Steel 42mm Automatic
TOP
Omega Diver 007 Bond Master Chronometer “James Bond" Limited
7 759 
Free shipping
Professional dealer
5114
IT
Omega Seamaster Aqua Terra 231.20.42.21.06.003 Very good Gold/Steel 41.5mm Automatic Finland, Jyväskylä
Omega Seamaster Aqua Terra
5 990 
Professional dealer
11
FI
Heuer Good 38mm Manual winding
TOP
Heuer Super sport 1975 48 mm Super Retro Watch Sports
1 150 
Free shipping
Professional dealer
860
NL
Rolex GMT-Master II 116713LN Very good Gold/Steel 40mm Automatic Finland, Imatra
Rolex GMT-Master II Steel/Gold SERVICED 2020
13 290 
Professional dealer
39
FI
TAG Heuer Autavia WBE5190.FC8268 New Bronze 42mm Automatic
TOP
TAG Heuer Autavia Calibre 5 Chronometer Bronze
2 920 
Professional dealer
346
DE
Ball Engineer Hydrocarbon Spacemaster DM2036A-SCAJ-WH New Steel 41.5mm Automatic
TOP
Ball Engineer Hydrocarbon Spacemaster
2 299 
Free shipping
Professional dealer
107
JP
Ulysse Nardin Marine 263-55 Very good Steel 40.5mm Automatic
Ulysse Nardin Marine Chronometer Automatik Stahl Herrenuhr...
3 550 

Sold by Chrono24

DE
Certina DS Podium C034.453.16.057.00 Very good Steel 42mm Quartz Finland, Vaasa
Certina DS Podium
315 
Private Seller
 
FI
Tissot T-Complication T0704061605700 New Steel 43mm Manual winding
TOP
Tissot T-complication
1 094 
Free shipping
Professional dealer
51
RU
Omega Seamaster Planet Ocean Chronograph 2210.51.00 Very good Steel 45.5mm Automatic
TOP
Omega Seamaster Planet Ocean Chronograph Full Set Int’l Ship...
3 363 
Professional dealer
42
IL
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
5114
IT
Omega Speedmaster Professional Moonwatch Moonphase 304.30.44.52.01.001 Very good Steel 44,25mm Automatic Finland, Oulu
Omega Speedmaster Moonwatch Moonphase, Complete set
6 890 
Free shipping
Professional dealer
14
FI
Rolex Daytona 116520 Very good Steel 40mm Automatic Finland, Imatra
Rolex Cosmograph Daytona 2012 FULL SET
20 900 
Professional dealer
39
FI
Breitling Superocean 42 A17366D81A1A1 New Steel 42mm Automatic
TOP
Breitling Superocean 42 Automatik 500M
2 999 
Professional dealer
346
DE
Universal Genève Very good Steel 42mm Automatic
TOP
Universal Genève Senna 41 Chronograph Chronometer certified,...
1 495 
Professional dealer
373
ES
Maurice Lacroix Miros MI6028 Very good Steel 41mm Automatic
Maurice Lacroix Miros Diver Chronometer Automatik Herrenuhr...
950 

Sold by Chrono24

DE
Perrelet A1008/A0475 Very good Steel 42mm Automatic Finland, Kerava
Perrelet A1008/A0475 Chronograph Big Date
1 800 
Private Seller
 
FI
Omega Seamaster Aqua Terra 231.90.43.22.04.001 Very good Titanium 43mm Automatic
TOP
Omega Seamaster Aqua Terra GMT 2020
5 972 
Professional dealer
6
UK
Omega Speedmaster Racing 326.30.40.50.01.001 Very good Steel 40mm Automatic
TOP
Omega Speedmaster Racing 32630405001001 full set UK 2015
3 795 
Professional dealer
104
UK
Omega 522.53.39.50.04.001 Very good Rose gold 39mm Manual winding
TOP
Omega Olympic official timekeeper pink gold full set
8 900 
Professional dealer
69
UK
Rolex Datejust 126334 New Steel 41mm Automatic
Rolex Datejust 41mm Silver Dial UNWORN 2020 New Style Card 126334
10 400 
Professional dealer
47
US
IWC Ingenieur Chronograph Racer IW378509 Good Steel 45mm Automatic Finland, Imatra
IWC Ingenieur Chronograph Racer Flyback SERVICED 2014
6 590 
Professional dealer
39
FI
Rolex Submariner Date 16613 Very good Gold/Steel 40mm Automatic
TOP
Rolex Submariner Date Blue Steel & Gold 16613
10 077 
Free shipping
Professional dealer
714
UK
Hublot Big Bang 44 mm Very good Rose gold 44mm Automatic
Hublot BIG BANG 44
17 900 
Professional dealer
29
BE
Breitling Aerospace Avantage E79362 Very good Titanium Quartz Finland, Kirkkonummi
Breitling Aerospace Avantage Bronze
2 099 
Private Seller
 
FI
Breitling Aerospace Avantage E7936210/B962 Good 42mm Quartz Finland, Espoo
Breitling Aerospace
1 776 
Private Seller
 
FI
Omega Constellation 3681075 Good Yellow gold 35mm Automatic Finland, Vantaa
Omega Constellation 18kt yellow gold automatic diamond bezel
7 500 
Private Seller
 
FI
Breitling Avenger II A1338111/BC32-170A Very good Steel 43mm Automatic Finland, Helsinki
Breitling Avenger II
3 250 
Private Seller
 
FI
Omega Seamaster Aqua Terra 220.10.41.21.03.001 Very good Steel 41mm Automatic
Omega Seamaster Aqua Terra Co-Axial Chronometer 220.10.41.21.0...
4 250 

Sold by Chrono24

DE
B.R.M V12-44 V12 44 BG CG AN New Steel 44mm Automatic
TOP
B.R.M V12 44 BG CG AN PRIX FLASH
3 990 
Free shipping
Professional dealer
25
FR
Panerai Luminor 1950 8 Days GMT PAM00233 Very good Steel 44mm Manual winding Finland, Imatra
Panerai Luminor 1950 8 Days GMT
8 050 
Professional dealer
39
FI
Rolex Submariner (No Date) 114060 Unworn Steel 40mm Automatic
TOP
Rolex Submariner Non-Date Steel 114060
13 245 
Free shipping
Professional dealer
714
UK
Rolex Daytona 116515LN Very good Rose gold 40mm Automatic
Rolex DAYTONA OYSTERFLEX
29 950 
Professional dealer
29
BE
Rolex Daytona 116520 Very good Steel 40mm Automatic
Rolex Daytona Steel like NEW black dial
16 990 
Professional dealer
56
AT

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.


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