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Breitling Limited Edition Frecce Tricolori Chronomat 44 - 70...
TOP
Breitling Limited Edition Frecce Tricolori Chronomat 44 - 70...
R 52,784
Free shipping
Seller
Pawndeluxe
59
NL
Rolex Day-Date Tridor Masterpiece Meteorite Diamond Dial
TOP
Rolex Day-Date Tridor Masterpiece Meteorite Diamond Dial
R 604,342
Seller
Juwelier Burger, since 2001
574
NL
Rolex Gmt-Master II LN 18K Yellow Gold
TOP
Rolex Gmt-Master II LN 18K Yellow Gold
R 313,646
Seller
Juwelier Burger, since 2001
574
NL
Rolex Daytona Diamond & Ruby Set 116589SALV
TOP
Rolex Daytona Diamond & Ruby Set 116589SALV
R 1,484,310
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
145
UK
Rolex Submariner Date Full Diamonds
TOP
Rolex Submariner Date Full Diamonds
R 426,865
Seller
Juwelier Burger, since 2001
574
NL
Panerai Special Editions
Panerai Special Editions
R 179,000
Seller
Topwatch SA Pty Ltd
ZA
Rolex Day-Date Rose Gold 118395BR
TOP
Rolex Day-Date Rose Gold 118395BR
R 606,020
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
145
UK
Rolex Submariner James Bond No Crown Guards
TOP
Rolex Submariner James Bond No Crown Guards
R 374,845
Seller
Juwelier Burger, since 2001
574
NL
Rolex Day-Date 40 18 kt Weißgold Schwarz DIA 228239
TOP
Rolex Day-Date 40 18 kt Weißgold Schwarz DIA 228239
R 480,414
Seller
Uhren2000 GmbH
301
DE
Chopard Superfast
Chopard Superfast
R 65,000
Seller
Luxurytime South Africa
ZA
Doxa GRANDE METRE BLUE PLANET LIMITED EDITION 800PCS WORLD
TOP
Doxa GRANDE METRE BLUE PLANET LIMITED EDITION 800PCS WORLD
R 46,918
Free shipping
Seller
Przedsiębiorstwo Handlowe Usługowe
81
PL
Omega Seamaster 300
Omega Seamaster 300
R 84,000
Free shipping
Seller
The Diamond Channel
ZA
TAG Heuer Grand Carrera
TAG Heuer Grand Carrera
R 27,500
Seller
Private Seller
ZA
Louis Chevrolet Swiss Watches Chrono-Tour Classic
Louis Chevrolet Swiss Watches Chrono-Tour Classic
R 25,525
Free shipping
Seller
Louis Chevrolet Watch Company SA
 
CH
Omega Seamaster Planet Ocean Chronograph NEU 12/2017 mit Box/Pap.
Omega Seamaster Planet Ocean Chronograph NEU 12/2017 mit Box/Pap.
R 75,734
Seller
Matthias Wohne Uhrmachermeister
6
DE
Rolex Men's Rolex Submariner Date 16613 Two-Tone Gold Blue...
Rolex Men's Rolex Submariner Date 16613 Two-Tone Gold Blue...
R 89,186
Seller
Collectors Coins & Jewelry
5
US
Omega Speedmaster Moonphase Master Co-Axial Chronograph
TOP
Omega Speedmaster Moonphase Master Co-Axial Chronograph
R 102,126
Seller
Juwelier Burger, since 2001
574
NL
Rolex Datejust
Rolex Datejust
R 56,609
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
131
DE
Hublot Big Bang Carbon Bezel Baguette 24000€ HT
TOP
Hublot Big Bang Carbon Bezel Baguette 24000€ HT
R 440,634
Seller
RIVIERAWATCH
72
FR
Breitling Avenger II GMT Black PVD Steel 43mm M3239010/BF04...
Breitling Avenger II GMT Black PVD Steel 43mm M3239010/BF04...
R 35,823
Seller
Alux Watches
 
US
Breitling Bentley Motors
Breitling Bentley Motors
R 54,999
Free shipping
Seller
The Diamond Channel
ZA
Omega De Ville Hour Vision
Omega De Ville Hour Vision
R 183,598
Seller
Sfera GmbH
 
AT
Montblanc Timewalker
Montblanc Timewalker
R 71,833
Seller
Handelshaus Rheinländer
 
DE
TAG Heuer Grand Carrera
TAG Heuer Grand Carrera
R 60,900
Seller
Luxurytime South Africa
ZA
Rolex 2008 UNPOLISHED Rolex Submariner Green Kermit 50th...
Rolex 2008 UNPOLISHED Rolex Submariner Green Kermit 50th...
R 124,405
Seller
Collectors Coins & Jewelry
5
US
Chopard Tycoon Two O Ten Chrono
TOP
Chopard Tycoon Two O Ten Chrono
R 48,959
Seller
Juwelier Burger, since 2001
574
NL
Rolex Damenuhr Oyster Datejust
Rolex Damenuhr Oyster Datejust
R 30,600
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
131
DE
Omega Speedmaster Mark II Co-Axial Chronograph
Omega Speedmaster Mark II Co-Axial Chronograph
R 47,441
Seller
Horology 411
 
US
Omega Constellation Co-Axial 35mm
Omega Constellation Co-Axial 35mm
R 35,190
Seller
Soprana dal 1910 srl
 
IT
Omega Speedmaster Day Date
Omega Speedmaster Day Date
R 67,319
Seller
Terzian Garo & Sia OE
 
GR
Breitling Navitimer 1461
Breitling Navitimer 1461
R 106,400
Free shipping
Seller
The Diamond Channel
ZA
Louis Chevrolet Swiss Watches Chrono-Tour Fashion
Louis Chevrolet Swiss Watches Chrono-Tour Fashion
R 25,525
Free shipping
Seller
Louis Chevrolet Watch Company SA
 
CH
Breitling Superocean II Chronograph
Breitling Superocean II Chronograph
R 59,669
Seller
Juwelier Vogl GmbH
 
DE
Rolex Submariner Date 16613 U Two-Tone Gold Blue Stainless...
Rolex Submariner Date 16613 U Two-Tone Gold Blue Stainless...
R 94,216
Seller
Collectors Coins & Jewelry
5
US
Rolex Datejust Pearlmaster 34 White Gold Diamond MOP Dial
TOP
Rolex Datejust Pearlmaster 34 White Gold Diamond MOP Dial
R 439,104
Seller
Juwelier Burger, since 2001
574
NL
Rolex GMT Master II
Rolex GMT Master II
R 149,938
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
131
DE
Rolex GMT 16700 Bj.1993 (N) LC100 Tritium Blatt
Rolex GMT 16700 Bj.1993 (N) LC100 Tritium Blatt
R 122,383
Seller
Uhren - Borgardts
 
DE
Omega Seamaster Aqua Terra 150M Co-Axial 42 mm
Omega Seamaster Aqua Terra 150M Co-Axial 42 mm
R 148,408
Seller
Soprana dal 1910 srl
 
IT
Breitling Avenger II Seawolf Yellow Black M17331E2/I530 LIMITED
Breitling Avenger II Seawolf Yellow Black M17331E2/I530 LIMITED
R 37,709
Seller
Alux Watches
 
US
Omega Seamaster Planet Ocean
Omega Seamaster Planet Ocean
R 49,184
Seller
Martin Wilkinson Ltd
 
UK
Louis Chevrolet Swiss Watches LC-01 Classic
Louis Chevrolet Swiss Watches LC-01 Classic
R 12,750
Free shipping
Seller
Louis Chevrolet Watch Company SA
 
CH
Rolex Sea-Dweller
Rolex Sea-Dweller
R 99,247
Seller
A. W. Porter & Son Ltd
 
UK
Rolex 2015 Rolex Day-Date II 41mm Diamond President 218238 18K...
Rolex 2015 Rolex Day-Date II 41mm Diamond President 218238 18K...
R 528,012
Seller
Collectors Coins & Jewelry
5
US
Omega Seamaster Planet Ocean
Omega Seamaster Planet Ocean
R 68,419
Seller
Avanti Fine Jewellery
 
UK
Rolex Submariner Sea-Dweller  NEU
Rolex Submariner Sea-Dweller NEU
R 130,048
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
131
DE
Rolex GMT 2  Ref.16710 Bj.2007  (Z) Ungetragen LC100  NUR...
Rolex GMT 2 Ref.16710 Bj.2007 (Z) Ungetragen LC100 NUR...
R 305,996
Seller
Uhren - Borgardts
 
DE
Breitling Superocean 42
Breitling Superocean 42
R 30,600
Seller
Sfera GmbH
 
AT
Omega Speedmaster Professional Moon To Mars
Omega Speedmaster Professional Moon To Mars
R 66,750
Seller
Wrights The Jewellers
 
UK
Breitling Avenger II Seawolf
Breitling Avenger II Seawolf
R 35,000
Free shipping
Seller
The Diamond Channel
ZA
Louis Chevrolet Swiss Watches LC-01 Fashion
Louis Chevrolet Swiss Watches LC-01 Fashion
R 12,750
Free shipping
Seller
Louis Chevrolet Watch Company SA
 
CH
Omega Seamaster Ploprof White 1200m White  Rubber
Omega Seamaster Ploprof White 1200m White Rubber
R 62,856
Seller
Alux Watches
 
US
Rolex 1972 Rolex Day-Date President 36mm 1803 18K Yellow Gold...
Rolex 1972 Rolex Day-Date President 36mm 1803 18K Yellow Gold...
R 113,089
Seller
Collectors Coins & Jewelry
5
US
Breitling Navitimer World (A24322)
Breitling Navitimer World (A24322)
R 50,283
Seller
The Watch Movement
 
US
Rolex Yacht Master  Medium reserviert
Rolex Yacht Master Medium reserviert
R 105,569
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
131
DE
Rolex Day-Date Borke Ref. 18078 Bj.1983 LC100 +Papiere+Brillia...
Rolex Day-Date Borke Ref. 18078 Bj.1983 LC100 +Papiere+Brillia...
R 168,298
Seller
Uhren - Borgardts
 
DE
Panerai Luminor Marina GMT
Panerai Luminor Marina GMT
R 73,718
Seller
SWISSTIME.DK
 
DK
Eberhard & Co. Chrono 120 ÉME Aniversario
Eberhard & Co. Chrono 120 ÉME Aniversario
R 157,588
Seller
CANTELI JOYEROS SL
 
ES
Montblanc Timewalker
Montblanc Timewalker
R 41,233
Seller
Handelshaus Rheinländer
 
DE
Louis Chevrolet Swiss Watches Chrono-Tour Sport
Louis Chevrolet Swiss Watches Chrono-Tour Sport
R 25,525
Free shipping
Seller
Louis Chevrolet Watch Company SA
 
CH
Sinn 103 St Sa RB Classic Watch Sondermodell
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
R 37,485
Seller
Classic Watch
12
DE
Rolex RARE 1975 Rolex RED Submariner Date 1680 Matte Mark MK...
Rolex RARE 1975 Rolex RED Submariner Date 1680 Matte Mark MK...
R 375,869
Seller
Collectors Coins & Jewelry
5
US
Breitling Bentley Flying B
Breitling Bentley Flying B
R 105,658
Seller
Antonio Group
 
GI
Rolex Daytona
Rolex Daytona
R 211,902
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
131
DE
Rolex GMT-Master 1675 LC100 Full Set (Papiere+Rechnung+Besch+Box)
Rolex GMT-Master 1675 LC100 Full Set (Papiere+Rechnung+Besch+Box)
R 336,596
Seller
Uhren - Borgardts
 
DE
Breitling Superocean II 44
Breitling Superocean II 44
R 39,000
Free shipping
Seller
The Diamond Channel
ZA
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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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