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Breguet Secret de la Reine
TOP
Breguet Secret de la Reine
R 804,517
Free shipping
Seller
Chronometrie Stäuble AG
 
CH
Doxa GRANDE METRE BLUE PLANET LIMITED EDITION 800PCS WORLD
TOP
Doxa GRANDE METRE BLUE PLANET LIMITED EDITION 800PCS WORLD
R 49,760
Free shipping
Seller
Przedsiębiorstwo Handlowe Usługowe
172
PL
Rolex Datejust Pearlmaster
TOP
Rolex Datejust Pearlmaster
R 1,148,265
Free shipping
Seller
Chronometrie Stäuble AG
 
CH
Rolex Datejust Pearlmaster
TOP
Rolex Datejust Pearlmaster
R 350,331
Free shipping
Seller
Chronometrie Stäuble AG
 
CH
Rolex OYSTER PERPETUAL CHRONOMETER 18K GOLD HONEYCOMB WABENBLATT
TOP
Rolex OYSTER PERPETUAL CHRONOMETER 18K GOLD HONEYCOMB WABENBLATT
R 82,145
Seller
Timeless Watches GmbH
272
DE
Rolex GMT-Master II 116759SARU june 2020 Rolex warranty
TOP
Rolex GMT-Master II 116759SARU june 2020 Rolex warranty
R 1,135,870
Seller
MMC RIVIERA
6
MC
Breitling Navitimer World
Breitling Navitimer World
R 61,500
Seller
Private Seller
ZA
Rolex Datejust Pearlmaster
TOP
Rolex Datejust Pearlmaster
R 329,852
Free shipping
Seller
Chronometrie Stäuble AG
 
CH
TAG Heuer Grand Carrera
TAG Heuer Grand Carrera
R 27,500
Seller
Private Seller
ZA
Rado 56-H Chronometre, 1st Version, Very Rare
TOP
Rado 56-H Chronometre, 1st Version, Very Rare
R 113,364
Seller
Plus Ultra AG
5
CH
Breitling CHRONOMAT 44 GMT AUTOMATIC AB042011
TOP
Breitling CHRONOMAT 44 GMT AUTOMATIC AB042011
R 94,327
Free shipping
Seller
RIVIERAWATCH
104
FR
Omega Seamaster
Omega Seamaster
R 27,999
Seller
The Diamond Channel
ZA
Chopard Mille Miglia GMT Limited Edition 2005
TOP
Chopard Mille Miglia GMT Limited Edition 2005
R 70,786
Seller
MASTROLORENZI S.A.S DI MATTIA MASTROLORENZI & CO.
64
IT
Sinn 103 St Sa RB Classic Watch Sondermodell
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
R 40,332
Seller
Classic Watch
29
DE
Rolex GMT-Master II 116758SARU with 2 years warranty
TOP
Rolex GMT-Master II 116758SARU with 2 years warranty
R 1,135,870
Seller
MMC RIVIERA
6
MC
Rolex GMT-Master II 116758SARU
Rolex GMT-Master II 116758SARU
R 2,107,326
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
266
UK
Hublot Zebra Bang, limited edition: No. 66/250
TOP
Hublot Zebra Bang, limited edition: No. 66/250
R 364,958
Free shipping
Seller
Chronometrie Stäuble AG
 
CH
Rolex Oyster Perpetual 39
Rolex Oyster Perpetual 39
R 74,902
Seller
Juwelier Burger, since 2001
820
NL
Omega Seamaster Aqua Terra
Omega Seamaster Aqua Terra
R 43,900
Seller
Luxurytime South Africa
ZA
TAG Heuer Mercedes Benz 300 SLR Chronograph 1887, Service,...
TAG Heuer Mercedes Benz 300 SLR Chronograph 1887, Service,...
R 32,759
Free shipping
Seller
chronopark GmbH
 
DE
Breitling Starliner
Breitling Starliner
R 119,000
Seller
The Diamond Channel
ZA
Rolex Daytona
Rolex Daytona
R 251,867
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
362
DE
IWC Portuguese Chronograph 41mm IW371445 Ex IW371401
IWC Portuguese Chronograph 41mm IW371445 Ex IW371401
R 95,314
Free shipping
Seller
SORELLE RONCO
1009
IT
Chopard Mille Miglia
Chopard Mille Miglia
R 62,711
Free shipping
Seller
Express Watches
7
US
Rolex GMT-Master Vintage UAE Air Force 1675
Rolex GMT-Master Vintage UAE Air Force 1675
R 1,740,834
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
266
UK
Rolex Lady-Datejust
TOP
Rolex Lady-Datejust
R 160,172
Free shipping
Seller
Chronometrie Stäuble AG
 
CH
Rolex Daytona Gold/Steel Zenith A Serie
Rolex Daytona Gold/Steel Zenith A Serie
R 172,850
Seller
Juwelier Burger, since 2001
820
NL
Breitling Bentley Flying B
Breitling Bentley Flying B
R 113,587
Seller
Helmut Seidl GmbH
12
DE
Omega Seamaster Aqua Terra Annual Calendar, UNGETRAGEN, Ref...
Omega Seamaster Aqua Terra Annual Calendar, UNGETRAGEN, Ref...
R 73,914
Free shipping
Seller
chronopark GmbH
 
DE
Breitling Cockpit Lady
Breitling Cockpit Lady
R 41,999
Seller
The Diamond Channel
ZA
Breitling Avenger  Seawolf
Breitling Avenger Seawolf
R 37,039
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
362
DE
Breitling SUPEROCEAN II 44 Total Blue Diver Pro III Chrono...
Breitling SUPEROCEAN II 44 Total Blue Diver Pro III Chrono...
R 40,661
Free shipping
Seller
SORELLE RONCO
1009
IT
Chopard Mille Miglia Power Reserve
Chopard Mille Miglia Power Reserve
R 65,629
Free shipping
Seller
Express Watches
7
US
Rolex S/S Black Dial Submariner Date Gents NOS B&P 16610
Rolex S/S Black Dial Submariner Date Gents NOS B&P 16610
R 174,083
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
266
UK
Chaumet Liens
TOP
Chaumet Liens
R 124,334
Free shipping
Seller
Chronometrie Stäuble AG
 
CH
Rolex Gmt-Master II LN
Rolex Gmt-Master II LN
R 112,764
Seller
Juwelier Burger, since 2001
820
NL
Breitling Chronomat Evolution
Breitling Chronomat Evolution
R 74,078
Seller
Helmut Seidl GmbH
12
DE
Breitling 45mm Avenger II Seawolf Automatik Chronometer, Ref....
Breitling 45mm Avenger II Seawolf Automatik Chronometer, Ref....
R 44,282
Free shipping
Seller
chronopark GmbH
 
DE
TAG Heuer Grand Carrera
TAG Heuer Grand Carrera
R 58,300
Seller
The Diamond Channel
ZA
Rolex Submariner
Rolex Submariner
R 119,349
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
362
DE
TAG Heuer MONACO STEVE MCQUEEN CHRONOGRAPH CALIBRE 12 Blu
TAG Heuer MONACO STEVE MCQUEEN CHRONOGRAPH CALIBRE 12 Blu
R 57,946
Free shipping
Seller
SORELLE RONCO
1009
IT
Chopard Mille Miglia
Chopard Mille Miglia
R 74,381
Free shipping
Seller
Express Watches
7
US
Rolex Explorer I Unworn Steel 114270
Rolex Explorer I Unworn Steel 114270
R 127,356
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
266
UK
Chaumet Liens
TOP
Chaumet Liens
R 72,992
Free shipping
Seller
Chronometrie Stäuble AG
 
CH
Rolex Submariner Date Full Iced Diamonds
Rolex Submariner Date Full Iced Diamonds
R 459,286
Seller
Juwelier Burger, since 2001
820
NL
Omega Constellation Gold on Steel Cal 564 168.010 Pie Pan 1970s
Omega Constellation Gold on Steel Cal 564 168.010 Pie Pan 1970s
R 27,716
Seller
ExpertsWatches
 
US
Breitling 47mm Chronomat GMT Limited Edition, 2.000 Stück,...
Breitling 47mm Chronomat GMT Limited Edition, 2.000 Stück,...
R 77,206
Free shipping
Seller
chronopark GmbH
 
DE
Omega Constellation Ladies
Omega Constellation Ladies
R 98,999
Seller
The Diamond Channel
ZA
Rolex Explorer
Rolex Explorer
R 79,840
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
362
DE
Baume & Mercier Classima Automatic Chronograf date Men's 40mm...
Baume & Mercier Classima Automatic Chronograf date Men's 40mm...
R 36,875
Free shipping
Seller
SORELLE RONCO
1009
IT
Chopard Mille Miglia
Chopard Mille Miglia
R 105,015
Free shipping
Seller
Express Watches
7
US
Rolex Unworn Daytona 116500LN
Rolex Unworn Daytona 116500LN
R 334,423
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
266
UK
Jaquet-Droz Legend  Geneva
TOP
Jaquet-Droz Legend Geneva
R 160,172
Free shipping
Seller
Chronometrie Stäuble AG
 
CH
Rolex Explorer II White
Rolex Explorer II White
R 73,667
Seller
Juwelier Burger, since 2001
820
NL
Rolex Datejust
Rolex Datejust
R 80,663
Seller
Stephan Hermann GmbH
81
DE
Breitling Navitimer Fighter Chronograph, B&P, Service, Ref....
Breitling Navitimer Fighter Chronograph, B&P, Service, Ref....
R 57,452
Free shipping
Seller
chronopark GmbH
 
DE
Breitling Navitimer 1461
Breitling Navitimer 1461
R 106,400
Seller
The Diamond Channel
ZA
Omega Seamaster Co-Axial 600 m
Omega Seamaster Co-Axial 600 m
R 57,617
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
362
DE
Breitling SUPER AVENGER II Chrono 48mm Steel Black Chablon Dial
Breitling SUPER AVENGER II Chrono 48mm Steel Black Chablon Dial
R 62,555
Free shipping
Seller
SORELLE RONCO
1009
IT
Breitling Bentley Flying B
Breitling Bentley Flying B
R 113,587
Seller
Helmut Seidl GmbH
12
DE
Rolex Explorer II Steve McQueen 1655
Rolex Explorer II Steve McQueen 1655
R 365,575
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
266
UK
Rolex Lady-Datejust
TOP
Rolex Lady-Datejust
R 76,795
Free shipping
Seller
Chronometrie Stäuble AG
 
CH
Rolex Oyster Perpetual Air-King 40 MM NEW
Rolex Oyster Perpetual Air-King 40 MM NEW
R 93,010
Seller
Juwelier Burger, since 2001
820
NL
Omega REF 2279-2 Pre SpeedMaster Cal 321 Chronograph Watch
Omega REF 2279-2 Pre SpeedMaster Cal 321 Chronograph Watch
R 72,937
Seller
ExpertsWatches
 
US
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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.

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