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Rolex Gmt-Master II LN 18K Yellow Gold
TOP
Rolex Gmt-Master II LN 18K Yellow Gold
฿802,171
Seller
Juwelier Burger, since 2001
570
NL
Rolex Submariner Date Full Diamonds
TOP
Rolex Submariner Date Full Diamonds
฿1,091,735
Seller
Juwelier Burger, since 2001
570
NL
Rolex Daytona Diamond & Ruby Set 116589SALV
TOP
Rolex Daytona Diamond & Ruby Set 116589SALV
฿3,774,208
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
144
UK
Rolex Day-Date Tridor Masterpiece Meteorite Diamond Dial
TOP
Rolex Day-Date Tridor Masterpiece Meteorite Diamond Dial
฿1,545,646
Seller
Juwelier Burger, since 2001
570
NL
Breitling Limited Edition Frecce Tricolori Chronomat 44 - 70...
TOP
Breitling Limited Edition Frecce Tricolori Chronomat 44 - 70...
฿134,999
Free shipping
Seller
Pawndeluxe
57
NL
Rolex Submariner James Bond No Crown Guards
TOP
Rolex Submariner James Bond No Crown Guards
฿958,692
Seller
Juwelier Burger, since 2001
570
NL
Breitling Chronomat 44mm B01 Manufaktur Stahl-/Roségold MOP...
TOP
Breitling Chronomat 44mm B01 Manufaktur Stahl-/Roségold MOP...
฿289,525
Seller
Uhrenkapital
270
DE
Omega Men's Omega Seamaster Professional 300M 2561.80 Blue...
Omega Men's Omega Seamaster Professional 300M 2561.80 Blue...
฿47,462
Seller
Collectors Coins & Jewelry
 
US
Rolex Yacht Master
Rolex Yacht Master
฿352,172
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
124
DE
Rolex Day-Date Borke Ref. 18078 Bj.1983 LC100 +Papiere+Brillia...
Rolex Day-Date Borke Ref. 18078 Bj.1983 LC100 +Papiere+Brillia...
฿430,433
Seller
Uhren - Borgardts
 
DE
Breitling Super Avenger II
Breitling Super Avenger II
฿115,000
Seller
Private Seller
TH
Longines Hydro Conquest
Longines Hydro Conquest
฿31,304
Seller
SIMARI GIOIELLI
6
IT
Omega Seamaster Planet Ocean Chronograph NEU 12/2017 mit Box/Pap.
Omega Seamaster Planet Ocean Chronograph NEU 12/2017 mit Box/Pap.
฿193,695
Seller
Matthias Wohne Uhrmachermeister
6
DE
Doxa GRANDE METRE BLUE PLANET LIMITED EDITION 800PCS WORLD
TOP
Doxa GRANDE METRE BLUE PLANET LIMITED EDITION 800PCS WORLD
฿121,962
Free shipping
Seller
Przedsiębiorstwo Handlowe Usługowe
78
PL
Chopard Tycoon Two O Ten Chrono
TOP
Chopard Tycoon Two O Ten Chrono
฿125,217
Seller
Juwelier Burger, since 2001
570
NL
Montblanc Timewalker
Montblanc Timewalker
฿183,717
Seller
Handelshaus Rheinländer
 
DE
Rolex 2008 UNPOLISHED Rolex Submariner Green Kermit 50th...
Rolex 2008 UNPOLISHED Rolex Submariner Green Kermit 50th...
฿314,530
Seller
Collectors Coins & Jewelry
 
US
Rolex Submariner
Rolex Submariner
฿391,303
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
124
DE
Rolex GMT 2  Ref.16710 Bj.2007  (Z) Ungetragen LC100  NUR...
Rolex GMT 2 Ref.16710 Bj.2007 (Z) Ungetragen LC100 NUR...
฿782,606
Seller
Uhren - Borgardts
 
DE
Louis Chevrolet Swiss Watches Chrono-Tour Fashion
Louis Chevrolet Swiss Watches Chrono-Tour Fashion
฿65,315
Free shipping
Seller
Louis Chevrolet Watch Company SA
 
CH
Hublot Big Bang Carbon Bezel Baguette 24000€ HT
TOP
Hublot Big Bang Carbon Bezel Baguette 24000€ HT
฿1,126,952
Seller
RIVIERAWATCH
72
FR
Breitling Navitimer World (A24322)
Breitling Navitimer World (A24322)
฿127,128
Seller
The Watch Movement
 
US
Omega Grey Side of the Moon Speedmaster UNWORN
Omega Grey Side of the Moon Speedmaster UNWORN
฿301,401
Seller
LBA Exquisite Time Pieces
5
US
Rolex Datejust Pearlmaster 34 White Gold Diamond MOP Dial
TOP
Rolex Datejust Pearlmaster 34 White Gold Diamond MOP Dial
฿1,123,039
Seller
Juwelier Burger, since 2001
570
NL
TAG Heuer Grand Carrera
TAG Heuer Grand Carrera
฿161,647
Seller
SIMARI GIOIELLI
6
IT
Rolex 2014 ENGRAVED Rolex Daytona Cosmograph 116523 Black 40mm...
Rolex 2014 ENGRAVED Rolex Daytona Cosmograph 116523 Black 40mm...
฿393,973
Seller
Collectors Coins & Jewelry
 
US
Rolex Damenuhr Oyster Datejust
Rolex Damenuhr Oyster Datejust
฿78,261
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
124
DE
Rolex GMT 16700 Bj.1993 (N) LC100 Tritium Blatt
Rolex GMT 16700 Bj.1993 (N) LC100 Tritium Blatt
฿313,003
Seller
Uhren - Borgardts
 
DE
Louis Chevrolet Swiss Watches Chrono-Tour Sport
Louis Chevrolet Swiss Watches Chrono-Tour Sport
฿65,315
Free shipping
Seller
Louis Chevrolet Watch Company SA
 
CH
Breitling Superocean II Chronograph
Breitling Superocean II Chronograph
฿152,608
Seller
Juwelier Vogl GmbH
 
DE
TAG Heuer Grand Carrera CAV518.BFC6237
TAG Heuer Grand Carrera CAV518.BFC6237
฿224,490
Seller
JOYERÍA TACTOC
 
ES
Omega Constellation Co-Axial 35mm
Omega Constellation Co-Axial 35mm
฿90,000
Seller
Soprana dal 1910 srl
 
IT
Omega Speedmaster Moonphase Master Co-Axial Chronograph
TOP
Omega Speedmaster Moonphase Master Co-Axial Chronograph
฿261,195
Seller
Juwelier Burger, since 2001
570
NL
Omega Speedmaster Professional Moon To Mars
Omega Speedmaster Professional Moon To Mars
฿169,728
Seller
Wrights The Jewellers
 
UK
Rolex 1972 Rolex Day-Date President 36mm 1803 18K Yellow Gold...
Rolex 1972 Rolex Day-Date President 36mm 1803 18K Yellow Gold...
฿285,919
Seller
Collectors Coins & Jewelry
 
US
Rolex Submariner Sea-Dweller  NEU
Rolex Submariner Sea-Dweller NEU
฿332,607
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
124
DE
Rolex DateJust Stahl 36mm Referenz 1603 Baujahr ca.1974
Rolex DateJust Stahl 36mm Referenz 1603 Baujahr ca.1974
฿107,608
Seller
Uhren - Borgardts
 
DE
Louis Chevrolet Swiss Watches LC-01 Classic
Louis Chevrolet Swiss Watches LC-01 Classic
฿32,625
Free shipping
Seller
Louis Chevrolet Watch Company SA
 
CH
Omega De Ville Hour Vision
Omega De Ville Hour Vision
฿469,563
Seller
Sfera GmbH
 
AT
Omega Speedmaster Day Date
Omega Speedmaster Day Date
฿172,173
Seller
Terzian Garo & Sia OE
 
GR
Omega Seamaster Aqua Terra 150M Co-Axial 42 mm
Omega Seamaster Aqua Terra 150M Co-Axial 42 mm
฿379,564
Seller
Soprana dal 1910 srl
 
IT
Omega Seamaster Planet Ocean
Omega Seamaster Planet Ocean
฿140,869
Seller
STECCO GIOIELLI
 
IT
Rolex Date - Under Factory Warranty & Original Papers
Rolex Date - Under Factory Warranty & Original Papers
฿189,150
Seller
Horology 411
 
US
Rolex Vintage Rolex Daytona Cosmograph 6265 Black 37mm 18K...
Rolex Vintage Rolex Daytona Cosmograph 6265 Black 37mm 18K...
฿3,814,574
Seller
Collectors Coins & Jewelry
 
US
Rolex GMT Master II
Rolex GMT Master II
฿283,695
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
124
DE
Rolex GMT-Master 1675 LC100 Full Set (Papiere+Rechnung+Besch+Box)
Rolex GMT-Master 1675 LC100 Full Set (Papiere+Rechnung+Besch+Box)
฿860,866
Seller
Uhren - Borgardts
 
DE
Louis Chevrolet Swiss Watches Chrono-Tour Classic
Louis Chevrolet Swiss Watches Chrono-Tour Classic
฿65,315
Free shipping
Seller
Louis Chevrolet Watch Company SA
 
CH
Breitling Superocean 42
Breitling Superocean 42
฿78,261
Seller
Sfera GmbH
 
AT
Breitling Avenger II Seawolf Yellow Black M17331E2/I530 LIMITED
Breitling Avenger II Seawolf Yellow Black M17331E2/I530 LIMITED
฿95,338
Seller
Alux Watches
 
US
Rolex Sea-Dweller
Rolex Sea-Dweller
฿252,358
Seller
A. W. Porter & Son Ltd
 
UK
Omega Seamaster Planet Ocean
Omega Seamaster Planet Ocean
฿125,063
Seller
Martin Wilkinson Ltd
 
UK
Omega Speedmaster Mark II Co-Axial Chronograph
Omega Speedmaster Mark II Co-Axial Chronograph
฿119,944
Seller
Horology 411
 
US
Rolex 2010 ENGRAVED Rolex Explorer II Black PVD Stainless...
Rolex 2010 ENGRAVED Rolex Explorer II Black PVD Stainless...
฿222,339
Seller
Collectors Coins & Jewelry
 
US
Rolex Datejust
Rolex Datejust
฿144,782
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
124
DE
Breitling Super Avenger Black Limitierte Serie Bj.2009
Breitling Super Avenger Black Limitierte Serie Bj.2009
฿115,434
Seller
Uhren - Borgardts
 
DE
Louis Chevrolet Swiss Watches LC-01 Fashion
Louis Chevrolet Swiss Watches LC-01 Fashion
฿32,625
Free shipping
Seller
Louis Chevrolet Watch Company SA
 
CH
Omega Seamaster Planet Ocean
Omega Seamaster Planet Ocean
฿173,971
Seller
Avanti Fine Jewellery
 
UK
Tissot Ballade Powermatic 80 COSC
Tissot Ballade Powermatic 80 COSC
฿34,826
Seller
ANZOVINO GIOIELLIERI SRL
 
IT
Omega Constellation 18195191
Omega Constellation 18195191
฿147,325
Seller
JOYERÍA TACTOC
 
ES
Omega De Ville Hour Vision
Omega De Ville Hour Vision
฿211,304
Seller
Sfera GmbH
 
AT
Breitling Windrider Chronomat
Breitling Windrider Chronomat
฿199,564
Seller
Badel Watch
6
BE
IWC 2017 IWC Pilot Midnight Mark XVIII 40mm Le Petit Prince...
IWC 2017 IWC Pilot Midnight Mark XVIII 40mm Le Petit Prince...
฿107,863
Seller
Collectors Coins & Jewelry
 
US
Rolex GMT Master II
Rolex GMT Master II
฿919,562
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
124
DE
Rolex Milgauss 116400GV Bj.2011 LC100
Rolex Milgauss 116400GV Bj.2011 LC100
฿234,782
Seller
Uhren - Borgardts
 
DE
Louis Chevrolet Swiss Watches LC-01 Elegance
Louis Chevrolet Swiss Watches LC-01 Elegance
฿32,625
Free shipping
Seller
Louis Chevrolet Watch Company SA
 
CH
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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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