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Franck Muller 18Kt Perpetual Calendar Moon folding closure
TOP
Franck Muller 18Kt Perpetual Calendar Moon folding closure
S$ 22,208
Seller
Ingo Freiherr von Seld
9
DE
Rolex GMT-Master II 116759SARU june 2020 Rolex warranty
TOP
Rolex GMT-Master II 116759SARU june 2020 Rolex warranty
S$ 98,492
Seller
MMC RIVIERA
6
MC
Rolex LADY PEARLMASTER DATEJUST MASTERPIECE GOLD DIAMANT DIAMOND
TOP
Rolex LADY PEARLMASTER DATEJUST MASTERPIECE GOLD DIAMANT DIAMOND
S$ 28,578
Seller
Timeless Watches GmbH
218
DE
Chopard Mille Miglia Speed Black Power Control
Chopard Mille Miglia Speed Black Power Control
S$ 25,000
Seller
Private Seller
SG
Omega De Ville Prestige 18K Gold Luxusuhr Goldband Unisex...
TOP
Omega De Ville Prestige 18K Gold Luxusuhr Goldband Unisex...
S$ 11,118
Seller
Uhrenkapital
322
DE
Ulysse Nardin Maxi Marine Diver 200m 45mm NEW
TOP
Ulysse Nardin Maxi Marine Diver 200m 45mm NEW
S$ 9,516
Seller
Timepiece Bank
380
BE
Breitling Chronomat 44
TOP
Breitling Chronomat 44
S$ 7,599
Seller
Private Seller
SG
Perrelet Turbine Macau  (Limited Edition)
TOP
Perrelet Turbine Macau (Limited Edition)
S$ 6,513
Free shipping
Seller
Istock LTD
99
LV
Bulgari Diagono Scuba SC38G 18K Gold Chronograph - FULL SET
TOP
Bulgari Diagono Scuba SC38G 18K Gold Chronograph - FULL SET
S$ 8,737
Free shipping
Seller
Pawndeluxe
138
NL
Rolex Sea-Dweller Deepsea
Rolex Sea-Dweller Deepsea
S$ 19,800
Seller
ARIELLE JEWELLERS AND WATCHES TRADING
SG
Hublot King Power F1 India,  Ltd Edition, Box & Papers
TOP
Hublot King Power F1 India, Ltd Edition, Box & Papers
S$ 29,262
Seller
Tempvs Ltd
108
UK
Rolex Day-Date 40 Everose-Gold 228345RBR Choco Diamant
TOP
Rolex Day-Date 40 Everose-Gold 228345RBR Choco Diamant
S$ 62,844
Seller
Uhren2000 GmbH
341
DE
Rolex Daydate
Rolex Daydate
S$ 13,900
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
229
DE
Panerai Luminor Power Reserve PAM27
Panerai Luminor Power Reserve PAM27
S$ 9,850
Seller
Monster Time Gallery
SG
Omega Speedmaster 125 Anniversary Ref ST 378.0801
Omega Speedmaster 125 Anniversary Ref ST 378.0801
S$ 4,980
Seller
GRluxury Pte Ltd
 
SG
Breitling Navitimer GMT
Breitling Navitimer GMT
S$ 6,300
Seller
s.t watch
SG
Rolex Vintage Oyster Perpetual Datejust Ref 1601 (Year 1970)
Rolex Vintage Oyster Perpetual Datejust Ref 1601 (Year 1970)
S$ 3,950
Seller
Asia Timepiece
SG
Ulysse Nardin Marine Chronometer Blue Dial - FULL SET / 263-67
TOP
Ulysse Nardin Marine Chronometer Blue Dial - FULL SET / 263-67
S$ 5,719
Free shipping
Seller
Pawndeluxe
138
NL
Rolex Sea-Dweller
Rolex Sea-Dweller
S$ 19,800
Seller
ARIELLE JEWELLERS AND WATCHES TRADING
SG
Panerai Luminor Marina Automatic Acciaio
Panerai Luminor Marina Automatic Acciaio
S$ 8,324
Seller
LUX-Timepieces GmbH
632
DE
Ball WATCH ENGINEER HYDROCARBON AIRBORNE MEN'S 42MM WATCH...
Ball WATCH ENGINEER HYDROCARBON AIRBORNE MEN'S 42MM WATCH...
S$ 2,655
Free shipping
Seller
The Watch Outlet
8
US
Omega Seamaster 300 Liquidmetal
Omega Seamaster 300 Liquidmetal
S$ 7,546
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
229
DE
Breitling Navitimer Heritage Blue Dial
Breitling Navitimer Heritage Blue Dial
S$ 5,577
Seller
The Watch Movement
 
US
Omega Ploprof 1200M
Omega Ploprof 1200M
S$ 7,280
Seller
GRluxury Pte Ltd
 
SG
Omega Constellation
Omega Constellation
S$ 1,986
Seller
Niklas Heyns
 
DE
Rolex Sea-Dweller
Rolex Sea-Dweller
S$ 19,524
Seller
Labelle Jewelry
40
US
Omega Seamaster Planet Ocean 600m Co-Axial Ceramic 232.30.38.2...
TOP
Omega Seamaster Planet Ocean 600m Co-Axial Ceramic 232.30.38.2...
S$ 4,210
Free shipping
Seller
Pawndeluxe
138
NL
Rolex Submariner Ref. 16610
Rolex Submariner Ref. 16610
S$ 9,516
Seller
Henry´s Auktionshaus AG
DE
Breitling Navitimer 01 (46mm)
Breitling Navitimer 01 (46mm)
S$ 10,008
Seller
LUX-Timepieces GmbH
632
DE
Ball GM1020D-LCJ-BK Trainmaster WorldTime Automatic Black Dial...
Ball GM1020D-LCJ-BK Trainmaster WorldTime Automatic Black Dial...
S$ 1,674
Free shipping
Seller
The Watch Outlet
8
US
Panerai Luminor Submersible 2500 Meter
Panerai Luminor Submersible 2500 Meter
S$ 19,063
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
229
DE
Breitling Avenger II Seawolf
Breitling Avenger II Seawolf
S$ 3,346
Seller
The Watch Movement
 
US
Rolex Air King
Rolex Air King
S$ 5,226
Seller
Pfandhaus SCHUMACHERS GmbH
5
DE
Omega Seamaster DIVER 300 Co-Axial 300 M 41 mm  Blue Dial
Omega Seamaster DIVER 300 Co-Axial 300 M 41 mm Blue Dial
S$ 4,369
Free shipping
Seller
SORELLE RONCO
606
IT
Rolex Datejust 126334
Rolex Datejust 126334
S$ 12,830
Seller
Labelle Jewelry
40
US
Chopard Men's 168511-3001 Mille Miglia Chronograph Watch
Chopard Men's 168511-3001 Mille Miglia Chronograph Watch
S$ 5,077
Seller
HarveyStore DE
13
DE
Panerai Ferrari FER00003 Full Set
Panerai Ferrari FER00003 Full Set
S$ 5,544
Seller
Henry´s Auktionshaus AG
DE
Breitling Navitimer 1 Chronograph 41
Breitling Navitimer 1 Chronograph 41
S$ 6,434
Seller
LUX-Timepieces GmbH
632
DE
Breitling Navitimer 46mm World GMT Blue Dial Brown Leather...
Breitling Navitimer 46mm World GMT Blue Dial Brown Leather...
S$ 5,623
Free shipping
Seller
The Watch Outlet
8
US
Breitling Aerospace
Breitling Aerospace
S$ 2,224
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
229
DE
Breitling Transocean Unitime Pilot
Breitling Transocean Unitime Pilot
S$ 6,972
Seller
The Watch Movement
 
US
Ulysse Nardin Marine Chronometer Automatic Mens Watch 1183-126...
Ulysse Nardin Marine Chronometer Automatic Mens Watch 1183-126...
S$ 8,918
Seller
Watch Obsession
5
US
Rolex Yacht-Master Blu Dial Oyster Rolesium 40mm 116622
Rolex Yacht-Master Blu Dial Oyster Rolesium 40mm 116622
S$ 15,727
Free shipping
Seller
SORELLE RONCO
606
IT
Rolex Datejust 41--126334--2018--EU--
Rolex Datejust 41--126334--2018--EU--
S$ 11,517
Seller
Marchal Watches
 
NL
Rolex GMT-Master II, Ref. 126711CH, LC100, unworn, Full Set
Rolex GMT-Master II, Ref. 126711CH, LC100, unworn, Full Set
S$ 23,177
Seller
S3 WATCH AG
17
DE
Breitling Navitimer World A24322
Breitling Navitimer World A24322
S$ 7,133
Seller
Henry´s Auktionshaus AG
DE
Breitling BENTLEY B06 MIDNIGHT CARBON CHRONOGRAPH LIMITED EDITION
Breitling BENTLEY B06 MIDNIGHT CARBON CHRONOGRAPH LIMITED EDITION
S$ 15,886
Seller
LUX-Timepieces GmbH
632
DE
Breitling Chronomat Evolution Rose Gold and Stainless Steel...
Breitling Chronomat Evolution Rose Gold and Stainless Steel...
S$ 5,997
Free shipping
Seller
The Watch Outlet
8
US
Rolex Submariner
Rolex Submariner
S$ 28,356
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
229
DE
Breitling Men's A1733110/BC30/152S/A20SS.1 Avenger II Seawolf...
Breitling Men's A1733110/BC30/152S/A20SS.1 Avenger II Seawolf...
S$ 4,003
Seller
HarveyStore DE
13
DE
Omega Seamaster Planet Ocean
Omega Seamaster Planet Ocean
S$ 4,766
Seller
COMPRA-VENTA JAVIER CALVO
ES
IWC Portuguese Chronograph 41mm IW371445 Ex IW371401
IWC Portuguese Chronograph 41mm IW371445 Ex IW371401
S$ 9,039
Free shipping
Seller
SORELLE RONCO
606
IT
TAG Heuer Watch Grand Carrera CAV5185.FT6020
TAG Heuer Watch Grand Carrera CAV5185.FT6020
S$ 6,473
Seller
Watchfinder.co.uk Ltd
UK
Rolex Lady-Datejust, Ref. 79178, Zustand sehr gut (1)
Rolex Lady-Datejust, Ref. 79178, Zustand sehr gut (1)
S$ 11,422
Seller
S3 WATCH AG
17
DE
Breitling Superocean Heritage U2337012/BB81
Breitling Superocean Heritage U2337012/BB81
S$ 8,404
Seller
Henry´s Auktionshaus AG
DE
Omega Speedmaster Professional Moonwatch Co-Axial Chronograph BB
Omega Speedmaster Professional Moonwatch Co-Axial Chronograph BB
S$ 12,153
Seller
LUX-Timepieces GmbH
632
DE
Rolex 116900 AIR-KING 40MM STEEL BLACK DIAL OYSTER PERPETUAL...
Rolex 116900 AIR-KING 40MM STEEL BLACK DIAL OYSTER PERPETUAL...
S$ 8,158
Free shipping
Seller
The Watch Outlet
8
US
Breitling Bentley Supersport
Breitling Bentley Supersport
S$ 6,990
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
229
DE
Rolex Submariner Date
Rolex Submariner Date
S$ 12,414
Seller
Vine Jewellers Ltd
 
UK
Omega Constellation Men
Omega Constellation Men
S$ 5,552
Seller
Pfandhaus SCHUMACHERS GmbH
5
DE
Omega Seamaster AQUA TERRA Co-Axial Master Chronometer.Steel
Omega Seamaster AQUA TERRA Co-Axial Master Chronometer.Steel
S$ 6,275
Free shipping
Seller
SORELLE RONCO
606
IT
Omega Watch Planet Ocean 232.30.38.20.01.001
Omega Watch Planet Ocean 232.30.38.20.01.001
S$ 5,161
Seller
Watchfinder.co.uk Ltd
UK
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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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