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Rolex GMT-Master II 116758SARU
TOP
Rolex GMT-Master II 116758SARU
R 893,819
Seller
MMC RIVIERA
6
MC
Ulysse Nardin Perpetual Manufacture
TOP
Ulysse Nardin Perpetual Manufacture
R 357,980
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LUXE WARE (HK) LIMITED
54
HK
Rolex LADY DATEJUST 18K GOLD DIAMANT AUTOMATIK SERVICE 11/2016
TOP
Rolex LADY DATEJUST 18K GOLD DIAMANT AUTOMATIK SERVICE 11/2016
R 68,840
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Timeless Watches GmbH
198
DE
Hublot King Power F1 India,  Ltd Edition, Box & Papers
TOP
Hublot King Power F1 India, Ltd Edition, Box & Papers
R 293,120
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Tempvs Ltd
102
UK
Corum Two Tone Admiral Cup Triple Calendar Chronograph 18Kt/ SS
TOP
Corum Two Tone Admiral Cup Triple Calendar Chronograph 18Kt/ SS
R 53,519
Free shipping
Seller
Ye Olde Timekeepers, Inc.
14
US
Omega Seamaster Diver 300 M
TOP
Omega Seamaster Diver 300 M
R 50,000
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Private Seller
ZA
TAG Heuer Grand Carrera
TAG Heuer Grand Carrera
R 27,500
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Private Seller
ZA
Louis Moinet Memoris Red Eclipse
Straight from the manufacturer
Louis Moinet Memoris Red Eclipse
R 1,474,790
BrandBoutique Member
Louis Moinet
TAG Heuer Grand Carrera
TAG Heuer Grand Carrera
R 40,000
Free shipping
Seller
The Vault Melrose (Pty) Ltd
ZA
Sinn 103 St Sa RB Classic Watch Sondermodell
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
R 38,419
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Classic Watch
18
DE
Omega 42mm Seamaster Planet Ocean Chronometer von 2016,...
Omega 42mm Seamaster Planet Ocean Chronometer von 2016,...
R 54,727
Free shipping
Seller
chronopark GmbH
 
DE
Omega Seamaster Co-Axial Skyfall 007
Omega Seamaster Co-Axial Skyfall 007
R 86,246
Free shipping
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A. Grimmeissen Uhren An- und Verkauf
193
DE
B.R.M CT-48-AR
TOP
B.R.M CT-48-AR
R 235,216
Free shipping
Seller
Solexport International
MU
Chopard Superfast
Chopard Superfast
R 65,000
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Luxurytime South Africa
ZA
Ulysse Nardin Classico San Marco
TOP
Ulysse Nardin Classico San Marco
R 65,561
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Premium Lombard
RU
Rolex 2012 ENGRAVED UNPOLISHED Rolex Submariner 4-Line 40mm...
Rolex 2012 ENGRAVED UNPOLISHED Rolex Submariner 4-Line 40mm...
R 92,226
Seller
Collectors Coins of Lynbrook LLC
 
US
Louis Moinet Memoris 200th Anniversary
Straight from the manufacturer
Louis Moinet Memoris 200th Anniversary
R 925,096
BrandBoutique Member
Louis Moinet
Rolex Yacht-Master 116622 Full Set
Rolex Yacht-Master 116622 Full Set
R 131,564
Seller
Henry´s Auktionshaus AG
DE
Rolex Datejust 41 126334 18K White Gold Bezel Jubilee Bracelet...
Rolex Datejust 41 126334 18K White Gold Bezel Jubilee Bracelet...
R 115,066
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Carter's Diamonds
 
US
Omega 41,5mm Speedmaster '57 Co-Axial Chronograph, B&P, Ref....
Omega 41,5mm Speedmaster '57 Co-Axial Chronograph, B&P, Ref....
R 71,976
Free shipping
Seller
chronopark GmbH
 
DE
Rolex Submariner Weissgold
Rolex Submariner Weissgold
R 341,063
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
193
DE
B.R.M V8-44-GULF
TOP
B.R.M V8-44-GULF
R 108,199
Free shipping
Seller
Solexport International
MU
Breitling Chronomat Evolution Men's Watch
Breitling Chronomat Evolution Men's Watch
R 51,900
Seller
Luxurytime South Africa
ZA
Rolex Submariner Date
Rolex Submariner Date
R 90,449
Seller
Uhrmageren.com
9
DK
Rolex Vintage 1963 Rolex DateJust 1603 36mm Stainless Steel...
Rolex Vintage 1963 Rolex DateJust 1603 36mm Stainless Steel...
R 33,342
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Collectors Coins of Lynbrook LLC
 
US
Louis Moinet Memoris
Straight from the manufacturer
Louis Moinet Memoris
R 735,920
BrandBoutique Member
Louis Moinet
Rolex Pearlmaster Diamonds Reference 69308
Rolex Pearlmaster Diamonds Reference 69308
R 280,691
Seller
Henry´s Auktionshaus AG
DE
Rolex Oysterquartz 19018 Day Date President 18K Gold Watch...
Rolex Oysterquartz 19018 Day Date President 18K Gold Watch...
R 141,758
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Carter's Diamonds
 
US
Omega Ladymatic Co-Axial 34mm Chronometer von 2017, B&P, Ref...
Omega Ladymatic Co-Axial 34mm Chronometer von 2017, B&P, Ref...
R 76,053
Free shipping
Seller
chronopark GmbH
 
DE
Omega Seamaster Co Axial Aqua Terra
Omega Seamaster Co Axial Aqua Terra
R 49,395
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
193
DE
B.R.M DDF-12-44-SQ-AJ
TOP
B.R.M DDF-12-44-SQ-AJ
R 186,604
Free shipping
Seller
Solexport International
MU
Breitling Navitimer Men's Watch
Breitling Navitimer Men's Watch
R 54,900
Seller
Luxurytime South Africa
ZA
TAG Heuer Watch Grand Carrera CAV5185.FT6020
TAG Heuer Watch Grand Carrera CAV5185.FT6020
R 64,842
Seller
Watchfinder.co.uk Ltd
UK
Omega Seamaster Professional 300M 2541.80 Blue Wave Quartz...
Omega Seamaster Professional 300M 2541.80 Blue Wave Quartz...
R 30,680
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Collectors Coins of Lynbrook LLC
 
US
Hublot Big Bang Unico Red Sapphire (Limited Edition)
Hublot Big Bang Unico Red Sapphire (Limited Edition)
R 704,079
Free shipping
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Istock LTD
89
LV
Omega Speedmaster Broad Arrow 3551500
Omega Speedmaster Broad Arrow 3551500
R 36,945
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Henry´s Auktionshaus AG
DE
Rolex Date Chronometer Ref. 15000 von 1986
Rolex Date Chronometer Ref. 15000 von 1986
R 42,182
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Matthias Wohne Uhrmachermeister
6
DE
Omega Speedmaster Apollo 11 Pro von 2005, Limited Edition,...
Omega Speedmaster Apollo 11 Pro von 2005, Limited Edition,...
R 140,973
Free shipping
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chronopark GmbH
 
DE
Rolex Damenuhr  Datejust
Rolex Damenuhr Datejust
R 105,847
Free shipping
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A. Grimmeissen Uhren An- und Verkauf
193
DE
Chopard L.U.C. Tonneau
Chopard L.U.C. Tonneau
R 146,138
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Chronometrie Beyer AG
 
CH
Omega Seamaster America's Cup
Omega Seamaster America's Cup
R 34,498
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COMPRA-VENTA JAVIER CALVO
ES
Bremont Watch Martin Baker MBI
Bremont Watch Martin Baker MBI
R 488,534
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Watchfinder.co.uk Ltd
UK
Rolex Submariner Date 16613 Luminova Two-Tone 18K Gold Black...
Rolex Submariner Date 16613 Luminova Two-Tone 18K Gold Black...
R 96,240
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Collectors Coins of Lynbrook LLC
 
US
Hublot Classic Fusion Automatic 38mm Rose Gold
Hublot Classic Fusion Automatic 38mm Rose Gold
R 199,149
Free shipping
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Istock LTD
89
LV
Rolex Datejust Medium
Rolex Datejust Medium
R 46,886
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Henry´s Auktionshaus AG
DE
Hublot Big Bang King Power 48 mm 18k Rose Gold, B + P
Hublot Big Bang King Power 48 mm 18k Rose Gold, B + P
R 481,670
Free shipping
Seller
Luxury Watches USA
 
US
Breitling Windrider Cockpit 41 UTC Big Date 18k Rosègold / Stahl
Breitling Windrider Cockpit 41 UTC Big Date 18k Rosègold / Stahl
R 62,567
Free shipping
Seller
chronopark GmbH
 
DE
Breitling Chronomat 01 Glasboden
Breitling Chronomat 01 Glasboden
R 82,325
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
193
DE
Breitling Chronomat 44
Breitling Chronomat 44
R 99,026
Seller
Hulpiau A
 
BE
Omega Seamaster Diver 300 M
Omega Seamaster Diver 300 M
R 29,010
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Watch & Bullion
12
GI
Omega Watch Planet Ocean 2201.50.00
Omega Watch Planet Ocean 2201.50.00
R 49,830
Seller
Watchfinder.co.uk Ltd
UK
Breitling Old Navitimer Chronograph Black 42mm Automatic 81610...
Breitling Old Navitimer Chronograph Black 42mm Automatic 81610...
R 46,735
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Collectors Coins of Lynbrook LLC
 
US
Hublot Big Bang Unico Ferrari Carbon (Limited Edition)
Hublot Big Bang Unico Ferrari Carbon (Limited Edition)
R 327,734
Free shipping
Seller
Istock LTD
89
LV
Rolex Oyster Perpetual Medium Ref. 67488
Rolex Oyster Perpetual Medium Ref. 67488
R 133,132
Seller
Henry´s Auktionshaus AG
DE
Edox Limited Edition Miss GEICO Racing Chronoffshore-One
Edox Limited Edition Miss GEICO Racing Chronoffshore-One
R 13,313
Free shipping
Seller
Time Machine Plus
 
US
Breitling Roségold Montbrillant Olympus Chrono Limited...
Breitling Roségold Montbrillant Olympus Chrono Limited...
R 140,973
Free shipping
Seller
chronopark GmbH
 
DE
Rolex GMT Master II
Rolex GMT Master II
R 113,688
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
193
DE
Rolex Date Chronometer Ref. 15000 von 1987
Rolex Date Chronometer Ref. 15000 von 1987
R 42,182
Seller
Matthias Wohne Uhrmachermeister
6
DE
Omega Seamaster Planet Ocean
Omega Seamaster Planet Ocean
R 47,043
Seller
COMPRA-VENTA JAVIER CALVO
ES
Omega Watch Speedmaster Dark Side of the Moon 311.92.44.51.01.003
Omega Watch Speedmaster Dark Side of the Moon 311.92.44.51.01.003
R 109,254
Seller
Watchfinder.co.uk Ltd
UK
Rolex Vintage Rolex British Military California Dial Manual...
Rolex Vintage Rolex British Military California Dial Manual...
R 38,119
Seller
Collectors Coins of Lynbrook LLC
 
US
Omega Seamaster Planet Ocean Co-Axial 600m
Omega Seamaster Planet Ocean Co-Axial 600m
R 230,511
Free shipping
Seller
Istock LTD
89
LV
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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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