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Breitling Limited Edition Frecce Tricolori Chronomat 44 - 70...
TOP
Breitling Limited Edition Frecce Tricolori Chronomat 44 - 70...
S$ 5,663
Free shipping
Seller
Pawndeluxe
57
NL
Rolex Day-Date Tridor Masterpiece Meteorite Diamond Dial
TOP
Rolex Day-Date Tridor Masterpiece Meteorite Diamond Dial
S$ 64,838
Seller
Juwelier Burger, since 2001
570
NL
Rolex Daytona Diamond & Ruby Set 116589SALV
TOP
Rolex Daytona Diamond & Ruby Set 116589SALV
S$ 158,323
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
144
UK
Rolex Gmt-Master II LN 18K Yellow Gold
TOP
Rolex Gmt-Master II LN 18K Yellow Gold
S$ 33,650
Seller
Juwelier Burger, since 2001
570
NL
Rolex Submariner Date Full Diamonds
TOP
Rolex Submariner Date Full Diamonds
S$ 45,797
Seller
Juwelier Burger, since 2001
570
NL
Breitling Chronomat 44mm B01 Manufaktur Stahl-/Roségold MOP...
TOP
Breitling Chronomat 44mm B01 Manufaktur Stahl-/Roségold MOP...
S$ 12,145
Seller
Uhrenkapital
270
DE
Rolex Submariner James Bond No Crown Guards
TOP
Rolex Submariner James Bond No Crown Guards
S$ 40,216
Seller
Juwelier Burger, since 2001
570
NL
Omega Men's Omega Seamaster Professional 300M 2561.80 Blue...
Omega Men's Omega Seamaster Professional 300M 2561.80 Blue...
S$ 1,991
Seller
Collectors Coins & Jewelry
 
US
Rolex GMT 2  Ref.16710 Bj.2007  (Z) Ungetragen LC100  NUR...
Rolex GMT 2 Ref.16710 Bj.2007 (Z) Ungetragen LC100 NUR...
S$ 32,829
Seller
Uhren - Borgardts
 
DE
Rolex Yacht Master
Rolex Yacht Master
S$ 14,773
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
124
DE
Longines Hydro Conquest
Longines Hydro Conquest
S$ 1,313
Seller
SIMARI GIOIELLI
6
IT
Breitling Transocean Chronograph Unitime
Breitling Transocean Chronograph Unitime
S$ 11,000
Seller
Private Seller
SG
Omega Seamaster Planet Ocean Chronograph NEU 12/2017 mit Box/Pap.
Omega Seamaster Planet Ocean Chronograph NEU 12/2017 mit Box/Pap.
S$ 8,125
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
S$ 5,116
Free shipping
Seller
Przedsiębiorstwo Handlowe Usługowe
78
PL
Montblanc Timewalker
Montblanc Timewalker
S$ 7,707
Seller
Handelshaus Rheinländer
 
DE
Chopard Tycoon Two O Ten Chrono
TOP
Chopard Tycoon Two O Ten Chrono
S$ 5,253
Seller
Juwelier Burger, since 2001
570
NL
Rolex Men's Rolex Submariner Date Stainless Steel 40mm Black...
Rolex Men's Rolex Submariner Date Stainless Steel 40mm Black...
S$ 7,993
Seller
Collectors Coins & Jewelry
 
US
Rolex GMT 16700 Bj.1993 (N) LC100 Tritium Blatt
Rolex GMT 16700 Bj.1993 (N) LC100 Tritium Blatt
S$ 13,130
Seller
Uhren - Borgardts
 
DE
Breitling Superocean  42
Breitling Superocean 42
S$ 3,611
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
124
DE
TAG Heuer Grand Carrera
TAG Heuer Grand Carrera
S$ 6,781
Seller
SIMARI GIOIELLI
6
IT
Hublot Big Bang Carbon Bezel Baguette 24000€ HT
TOP
Hublot Big Bang Carbon Bezel Baguette 24000€ HT
S$ 47,274
Seller
RIVIERAWATCH
72
FR
Louis Chevrolet Swiss Watches Chrono-Tour Fashion
Louis Chevrolet Swiss Watches Chrono-Tour Fashion
S$ 2,740
Free shipping
Seller
Louis Chevrolet Watch Company SA
 
CH
Breitling Navitimer World (A24322)
Breitling Navitimer World (A24322)
S$ 5,333
Seller
The Watch Movement
 
US
Omega Constellation Co-Axial 35mm
Omega Constellation Co-Axial 35mm
S$ 3,775
Seller
Soprana dal 1910 srl
 
IT
Rolex Datejust Pearlmaster 34 White Gold Diamond MOP Dial
TOP
Rolex Datejust Pearlmaster 34 White Gold Diamond MOP Dial
S$ 47,110
Seller
Juwelier Burger, since 2001
570
NL
Rolex 2008 UNPOLISHED Rolex Submariner Green Kermit 50th...
Rolex 2008 UNPOLISHED Rolex Submariner Green Kermit 50th...
S$ 13,194
Seller
Collectors Coins & Jewelry
 
US
Rolex GMT-Master 1675 LC100 Full Set (Papiere+Rechnung+Besch+Box)
Rolex GMT-Master 1675 LC100 Full Set (Papiere+Rechnung+Besch+Box)
S$ 36,112
Seller
Uhren - Borgardts
 
DE
Rolex Datejust
Rolex Datejust
S$ 6,402
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
124
DE
Breitling Superocean II Chronograph
Breitling Superocean II Chronograph
S$ 6,402
Seller
Juwelier Vogl GmbH
 
DE
Omega Grey Side of the Moon Speedmaster UNWORN
Omega Grey Side of the Moon Speedmaster UNWORN
S$ 12,643
Seller
LBA Exquisite Time Pieces
5
US
Louis Chevrolet Swiss Watches LC-01 Classic
Louis Chevrolet Swiss Watches LC-01 Classic
S$ 1,369
Free shipping
Seller
Louis Chevrolet Watch Company SA
 
CH
TAG Heuer Grand Carrera CAV518.BFC6237
TAG Heuer Grand Carrera CAV518.BFC6237
S$ 9,417
Seller
JOYERÍA TACTOC
 
ES
Omega De Ville Hour Vision
Omega De Ville Hour Vision
S$ 19,697
Seller
Sfera GmbH
 
AT
Omega Speedmaster Moonphase Master Co-Axial Chronograph
TOP
Omega Speedmaster Moonphase Master Co-Axial Chronograph
S$ 10,957
Seller
Juwelier Burger, since 2001
570
NL
Rolex Vintage 1980 Rolex Submariner Date Matte Patina 16800...
Rolex Vintage 1980 Rolex Submariner Date Matte Patina 16800...
S$ 13,201
Seller
Collectors Coins & Jewelry
 
US
Rolex Milgauss 116400GV Bj.2011 LC100
Rolex Milgauss 116400GV Bj.2011 LC100
S$ 9,849
Seller
Uhren - Borgardts
 
DE
Rolex Submariner Sea-Dweller  NEU
Rolex Submariner Sea-Dweller NEU
S$ 13,952
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
124
DE
Omega Speedmaster Professional Moon To Mars
Omega Speedmaster Professional Moon To Mars
S$ 7,120
Seller
Wrights The Jewellers
 
UK
Omega Speedmaster Day Date
Omega Speedmaster Day Date
S$ 7,222
Seller
Terzian Garo & Sia OE
 
GR
Louis Chevrolet Swiss Watches Chrono-Tour Classic
Louis Chevrolet Swiss Watches Chrono-Tour Classic
S$ 2,740
Free shipping
Seller
Louis Chevrolet Watch Company SA
 
CH
Omega Speedmaster Mark II Co-Axial Chronograph
Omega Speedmaster Mark II Co-Axial Chronograph
S$ 5,031
Seller
Horology 411
 
US
Omega Seamaster Aqua Terra 150M Co-Axial 42 mm
Omega Seamaster Aqua Terra 150M Co-Axial 42 mm
S$ 15,922
Seller
Soprana dal 1910 srl
 
IT
Breitling Avenger II Seawolf Yellow Black M17331E2/I530 LIMITED
Breitling Avenger II Seawolf Yellow Black M17331E2/I530 LIMITED
S$ 3,999
Seller
Alux Watches
 
US
Panerai 2011  PAM 111 Luminor Marina Manual Wind Black Rubber...
Panerai 2011 PAM 111 Luminor Marina Manual Wind Black Rubber...
S$ 5,725
Seller
Collectors Coins & Jewelry
 
US
Rolex DateJust Stahl 36mm Referenz 1603 Baujahr ca.1974
Rolex DateJust Stahl 36mm Referenz 1603 Baujahr ca.1974
S$ 4,514
Seller
Uhren - Borgardts
 
DE
Rolex GMT Master II
Rolex GMT Master II
S$ 38,574
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
124
DE
Breitling Superocean 42
Breitling Superocean 42
S$ 3,283
Seller
Sfera GmbH
 
AT
Omega Seamaster Planet Ocean
Omega Seamaster Planet Ocean
S$ 5,909
Seller
STECCO GIOIELLI
 
IT
Louis Chevrolet Swiss Watches Chrono-Tour Sport
Louis Chevrolet Swiss Watches Chrono-Tour Sport
S$ 2,740
Free shipping
Seller
Louis Chevrolet Watch Company SA
 
CH
Rolex Date - Under Factory Warranty & Original Papers
Rolex Date - Under Factory Warranty & Original Papers
S$ 7,935
Seller
Horology 411
 
US
Omega Seamaster Planet Ocean
Omega Seamaster Planet Ocean
S$ 5,246
Seller
Martin Wilkinson Ltd
 
UK
Rolex Sea-Dweller
Rolex Sea-Dweller
S$ 10,586
Seller
A. W. Porter & Son Ltd
 
UK
Rolex Submariner Date 116618 Ceramic 18K Yellow Gold Blue 40mm...
Rolex Submariner Date 116618 Ceramic 18K Yellow Gold Blue 40mm...
S$ 32,796
Seller
Collectors Coins & Jewelry
 
US
Breitling Super Avenger Black Limitierte Serie Bj.2009
Breitling Super Avenger Black Limitierte Serie Bj.2009
S$ 4,842
Seller
Uhren - Borgardts
 
DE
Rolex GMT Master II
Rolex GMT Master II
S$ 11,901
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
124
DE
Omega Seamaster Planet Ocean
Omega Seamaster Planet Ocean
S$ 7,298
Seller
Avanti Fine Jewellery
 
UK
Tissot Ballade Powermatic 80 COSC
Tissot Ballade Powermatic 80 COSC
S$ 1,461
Seller
ANZOVINO GIOIELLIERI SRL
 
IT
Louis Chevrolet Swiss Watches LC-01 Fashion
Louis Chevrolet Swiss Watches LC-01 Fashion
S$ 1,369
Free shipping
Seller
Louis Chevrolet Watch Company SA
 
CH
Breitling Chronomat 44
TOP
Breitling Chronomat 44
S$ 7,599
Seller
Private Seller
SG
Omega De Ville Hour Vision
Omega De Ville Hour Vision
S$ 8,864
Seller
Sfera GmbH
 
AT
Omega Constellation 18195191
Omega Constellation 18195191
S$ 6,180
Seller
JOYERÍA TACTOC
 
ES
IWC 2017 IWC Pilot Midnight Mark XVIII 40mm Le Petit Prince...
IWC 2017 IWC Pilot Midnight Mark XVIII 40mm Le Petit Prince...
S$ 4,525
Seller
Collectors Coins & Jewelry
 
US
Rolex Explorer 2  LC100  Ref.216570
Rolex Explorer 2 LC100 Ref.216570
S$ 9,356
Seller
Uhren - Borgardts
 
DE
Breitling Chronomat 01 Glasboden
Breitling Chronomat 01 Glasboden
S$ 8,618
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
124
DE
Breitling Windrider Chronomat
Breitling Windrider Chronomat
S$ 8,371
Seller
Badel Watch
6
BE
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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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