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Franck Muller 18Kt Perpetual Calendar Moon folding closure
TOP
Franck Muller 18Kt Perpetual Calendar Moon folding closure
AU$ 22,203
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
AU$ 98,467
Seller
MMC RIVIERA
6
MC
Omega Seamaster Aqua Terra
TOP
Omega Seamaster Aqua Terra
AU$ 9,778
Seller
Private Seller
 
AU
Rolex Sea-Dweller
Rolex Sea-Dweller
AU$ 19,790
Seller
Private Seller
AU
Omega Seamaster Diver 300 M
Omega Seamaster Diver 300 M
AU$ 3,694
Seller
Private Seller
 
AU
Rolex Sea-Dweller
Rolex Sea-Dweller
AU$ 19,900
Seller
SWISS TIME MACHINE
AU
Omega De Ville Prestige 18K Gold Luxusuhr Goldband Unisex...
TOP
Omega De Ville Prestige 18K Gold Luxusuhr Goldband Unisex...
AU$ 11,116
Seller
Uhrenkapital
320
DE
Breitling Galactic 32
Breitling Galactic 32
AU$ 4,645
Seller
Private Seller
AU
Perrelet Turbine Macau  (Limited Edition)
TOP
Perrelet Turbine Macau (Limited Edition)
AU$ 6,511
Free shipping
Seller
Istock LTD
99
LV
Chopard Mille Miglia
Chopard Mille Miglia
AU$ 6,286
Seller
Private Seller
 
AU
Ball Watch for BMW GMT
Ball Watch for BMW GMT
AU$ 2,750
Seller
Private Seller
 
AU
Rolex LADY PEARLMASTER DATEJUST MASTERPIECE GOLD DIAMANT DIAMOND
TOP
Rolex LADY PEARLMASTER DATEJUST MASTERPIECE GOLD DIAMANT DIAMOND
AU$ 28,571
Seller
Timeless Watches GmbH
217
DE
Ulysse Nardin Maxi Marine Diver 200m 45mm NEW
TOP
Ulysse Nardin Maxi Marine Diver 200m 45mm NEW
AU$ 9,513
Seller
Timepiece Bank
377
BE
Hentschel H1 Chronometer White Gold / Steel, 39.5mm German...
Hentschel H1 Chronometer White Gold / Steel, 39.5mm German...
AU$ 10,500
Seller
Define Watches
 
AU
Omega Seamaster 300M Co-Axial
Omega Seamaster 300M Co-Axial
AU$ 4,500
Seller
Watch Trader Pty Ltd
AU
Bulgari Diagono Scuba SC38G 18K Gold Chronograph - FULL SET
TOP
Bulgari Diagono Scuba SC38G 18K Gold Chronograph - FULL SET
AU$ 8,735
Free shipping
Seller
Pawndeluxe
138
NL
Breitling Navitimer Fighters Chronograph A13330 Full Set
Breitling Navitimer Fighters Chronograph A13330 Full Set
AU$ 5,170
Seller
The Watch Culture
AU
Breitling Navitimer World Black Dial A2432212/B726-443A
Breitling Navitimer World Black Dial A2432212/B726-443A
AU$ 8,795
Seller
Zaeger Pty Ltd
AU
Hublot King Power F1 India,  Ltd Edition, Box & Papers
TOP
Hublot King Power F1 India, Ltd Edition, Box & Papers
AU$ 29,280
Seller
Tempvs Ltd
106
UK
Rolex Day-Date 40 Everose-Gold 228345RBR Choco Diamant
TOP
Rolex Day-Date 40 Everose-Gold 228345RBR Choco Diamant
AU$ 62,828
Seller
Uhren2000 GmbH
340
DE
Swiss Military Cx Swiss Military 20000 Feet Watch World Record...
Swiss Military Cx Swiss Military 20000 Feet Watch World Record...
AU$ 4,435
Seller
Watchpartners
AU
Rolex Daydate
Rolex Daydate
AU$ 13,896
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
227
DE
Rolex Sea-Dweller
Rolex Sea-Dweller
AU$ 21,000
Seller
Time Keeper Boutique
 
AU
Breitling Avenger II GMT
Breitling Avenger II GMT
AU$ 3,950
Seller
Watch Trader Pty Ltd
AU
Ulysse Nardin Nardin Marine Chronometer 43mm Blue Dial - FULL SET
TOP
Ulysse Nardin Nardin Marine Chronometer 43mm Blue Dial - FULL SET
AU$ 6,194
Free shipping
Seller
Pawndeluxe
138
NL
Breitling Chronomat Windrider MOP Dial A13352
Breitling Chronomat Windrider MOP Dial A13352
AU$ 3,750
Seller
The Watch Culture
AU
Omega Seamaster Black Dial Automatic Steel 212.30.41.20.01.003
Omega Seamaster Black Dial Automatic Steel 212.30.41.20.01.003
AU$ 4,495
Seller
Zaeger Pty Ltd
AU
Ball GM1020D-LCJ-BK Trainmaster WorldTime Automatic Black Dial...
Ball GM1020D-LCJ-BK Trainmaster WorldTime Automatic Black Dial...
AU$ 1,521
Free shipping
Seller
The Watch Outlet
7
US
Panerai Luminor Marina Automatic Acciaio
Panerai Luminor Marina Automatic Acciaio
AU$ 8,322
Seller
LUX-Timepieces GmbH
626
DE
Swiss Military Cx Swiss Military 20000 Feet Diving Watch World...
Swiss Military Cx Swiss Military 20000 Feet Diving Watch World...
AU$ 4,435
Seller
Watchpartners
AU
Rolex Yacht Master Damenuhr
Rolex Yacht Master Damenuhr
AU$ 14,294
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
227
DE
Rolex Submariner Ref. 16610
Rolex Submariner Ref. 16610
AU$ 9,513
Seller
Henry´s Auktionshaus AG
DE
Rolex Datejust 126334
Rolex Datejust 126334
AU$ 12,851
Seller
Labelle Jewelry
39
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...
AU$ 4,209
Free shipping
Seller
Pawndeluxe
138
NL
Omega Seamaster Diver Chrono 300m Blue Waved Dial 2598.80
Omega Seamaster Diver Chrono 300m Blue Waved Dial 2598.80
AU$ 3,600
Seller
The Watch Culture
AU
Rolex Datejust 41 Stainless Steel Black Dial 126300
Rolex Datejust 41 Stainless Steel Black Dial 126300
AU$ 9,450
Seller
Zaeger Pty Ltd
AU
Omega Seamaster Aqua Terra Men’s Stainless Steel Automatic...
Omega Seamaster Aqua Terra Men’s Stainless Steel Automatic...
AU$ 3,129
Free shipping
Seller
The Watch Outlet
7
US
Breitling Navitimer 1 Chronograph 41
Breitling Navitimer 1 Chronograph 41
AU$ 6,432
Seller
LUX-Timepieces GmbH
626
DE
Swiss Military Cx Swiss Military 20000 Feet Diving Watch World...
Swiss Military Cx Swiss Military 20000 Feet Diving Watch World...
AU$ 4,435
Seller
Watchpartners
AU
Breitling Bentley Supersport
Breitling Bentley Supersport
AU$ 6,988
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
227
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
AU$ 4,367
Free shipping
Seller
SORELLE RONCO
606
IT
Rolex Air King
Rolex Air King
AU$ 5,225
Seller
Pfandhaus SCHUMACHERS GmbH
 
DE
Breitling Navitimer World A24322
Breitling Navitimer World A24322
AU$ 7,131
Seller
Henry´s Auktionshaus AG
DE
Ulysse Nardin Marine Chronometer Automatic Mens Watch 1183-126...
Ulysse Nardin Marine Chronometer Automatic Mens Watch 1183-126...
AU$ 8,933
Seller
Watch Obsession
5
US
Breitling Avenger II Black Dial Chronograph A1338111-BC33SS
Breitling Avenger II Black Dial Chronograph A1338111-BC33SS
AU$ 6,495
Seller
Zaeger Pty Ltd
AU
Ball WATCH ENGINEER HYDROCARBON AIRBORNE MEN'S 42MM WATCH...
Ball WATCH ENGINEER HYDROCARBON AIRBORNE MEN'S 42MM WATCH...
AU$ 2,660
Free shipping
Seller
The Watch Outlet
7
US
Omega Seamaster Planet Ocean 600 M Co-Axial Master Chronometer
Omega Seamaster Planet Ocean 600 M Co-Axial Master Chronometer
AU$ 6,877
Seller
LUX-Timepieces GmbH
626
DE
TAG Heuer Watch Grand Carrera CAV5185.FT6020
TAG Heuer Watch Grand Carrera CAV5185.FT6020
AU$ 6,477
Seller
Watchfinder.co.uk Ltd
UK
Rolex Damenuhr Date
Rolex Damenuhr Date
AU$ 2,938
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
227
DE
Rolex Yacht-Master Blu Dial Oyster Rolesium 40mm 116622
Rolex Yacht-Master Blu Dial Oyster Rolesium 40mm 116622
AU$ 15,723
Free shipping
Seller
SORELLE RONCO
606
IT
Zenith Men's 95.9000.9004/78.R582 Defy El Primero 21 - 44.00
Zenith Men's 95.9000.9004/78.R582 Defy El Primero 21 - 44.00
AU$ 12,062
Seller
HarveyStore DE
10
DE
Breitling Superocean Heritage U2337012/BB81
Breitling Superocean Heritage U2337012/BB81
AU$ 8,401
Seller
Henry´s Auktionshaus AG
DE
Breitling Navitimer Heritage Blue Dial
Breitling Navitimer Heritage Blue Dial
AU$ 5,586
Seller
The Watch Movement
 
US
TAG Heuer Carrera Calibre HEUER02T CAR5A90.BH0742
TAG Heuer Carrera Calibre HEUER02T CAR5A90.BH0742
AU$ 16,995
Seller
Zaeger Pty Ltd
AU
Breitling Chronomat Evolution Rose Gold and Stainless Steel...
Breitling Chronomat Evolution Rose Gold and Stainless Steel...
AU$ 6,006
Free shipping
Seller
The Watch Outlet
7
US
Rolex Submariner Date
Rolex Submariner Date
AU$ 41,292
Seller
LUX-Timepieces GmbH
626
DE
Rolex Datejust 41--126334--2018--EU--
Rolex Datejust 41--126334--2018--EU--
AU$ 11,514
Seller
Marchal Watches
 
NL
Omega De Ville Automatic Co Axial Chronograph
Omega De Ville Automatic Co Axial Chronograph
AU$ 5,320
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
227
DE
Omega Seamaster Planet Ocean
Omega Seamaster Planet Ocean
AU$ 4,765
Seller
COMPRA-VENTA JAVIER CALVO
ES
Omega Watch Planet Ocean 232.30.38.20.01.001
Omega Watch Planet Ocean 232.30.38.20.01.001
AU$ 5,164
Seller
Watchfinder.co.uk Ltd
UK
Rolex Pearlmaster Diamonds Reference 69308
Rolex Pearlmaster Diamonds Reference 69308
AU$ 28,428
Seller
Henry´s Auktionshaus AG
DE
TAG Heuer Grand Carrera Cal.36RS Cronograph Automatic CAV5185F...
TAG Heuer Grand Carrera Cal.36RS Cronograph Automatic CAV5185F...
AU$ 11,721
Free shipping
Seller
SORELLE RONCO
606
IT
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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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