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Chopard Mille Miglia GTS Automatic Black Dial Men's Watch
Chopard Mille Miglia GTS Automatic Black Dial Men's Watch
AU$ 4,609
Seller
Lombard Perspectiva
RU
Vacheron Constantin Malte Régulateur Dual Time
Vacheron Constantin Malte Régulateur Dual Time
AU$ 25,605
Seller
Rent a Box Schmuck und Uhren AG
 
CH
Patek Philippe Calatrava 18K gold rar dial dots blue hands...
Patek Philippe Calatrava 18K gold rar dial dots blue hands...
AU$ 15,051
Seller
Uhrenkapital
159
DE
Graham Chronofighter 43mm Roségold 2CFAR.B10A.C54B
Graham Chronofighter 43mm Roségold 2CFAR.B10A.C54B
AU$ 13,171
Seller
KROMINI GOLD IMPEX S.R.L
 
RO
Habring² Jumping Second Calendar enamel dial rose gold appliques
Habring² Jumping Second Calendar enamel dial rose gold appliques
AU$ 8,140
Seller
Define Watches
AU
TAG Heuer Grand Carrera
TAG Heuer Grand Carrera
AU$ 3,763
Seller
Reclaimed Jewels
 
NL
Longines Master Collection Chronograph Moonphase Calendar
Longines Master Collection Chronograph Moonphase Calendar
AU$ 2,499
Seller
Private seller
AU
Omega Sea master blue
Omega Sea master blue
price on request
Seller
Michel's Jewellery
AU
Omega ICONIC US Army Ref; 2179 / CK 2179 30t2 Original Full Size
Omega ICONIC US Army Ref; 2179 / CK 2179 30t2 Original Full Size
AU$ 2,670
Seller
Hobart Town Antique Jewellery
AU
Swiss Military Cx Swiss Military 20000 Feet Diving Watch World...
Swiss Military Cx Swiss Military 20000 Feet Diving Watch World...
AU$ 4,435
Free shipping
Seller
Watchpartners
AU
Breitling SuperOcean II  Abyss Yellow
Breitling SuperOcean II Abyss Yellow
AU$ 3,400
Seller
Topwatch Pty Ltd
AU
Omega Limited Edition Rio 2016 Olympic Mark II
Omega Limited Edition Rio 2016 Olympic Mark II
AU$ 7,519
Seller
Paul Zonjee Juweliers
25
NL
Rolex EXPLORER II so called "Albino"
Rolex EXPLORER II so called "Albino"
AU$ 32,212
Seller
Uhren Schöfer GmbH
DE
Breitling Chronomat GT (Bi-Colour)
Breitling Chronomat GT (Bi-Colour)
AU$ 3,650
Seller
Private seller
AU
Habring² Felix
Habring² Felix
AU$ 6,680
Seller
Define Watches
AU
Zenith El Primero Chronomaster - Men's wristwatch
Zenith El Primero Chronomaster - Men's wristwatch
AU$ 11,590
Estimated price
Seller
Catawiki BV
 
Omega Sea master blue dial 42 MM
Omega Sea master blue dial 42 MM
price on request
Seller
Michel's Jewellery
AU
Breitling Super Avenger II Diamond Set Bezel Lugs A13371
Breitling Super Avenger II Diamond Set Bezel Lugs A13371
AU$ 19,000
Seller
Zaeger Pty Ltd
AU
Swiss Military Cx Swiss Military 20000 Feet Watch World Record...
Swiss Military Cx Swiss Military 20000 Feet Watch World Record...
AU$ 4,435
Free shipping
Seller
Watchpartners
AU
Hublot 301.AI.460.RX
Hublot 301.AI.460.RX
AU$ 13,031
Seller
Deluxe ( Asia ) Ltd
 
HK
Omega Planet Ocean  600M Co-Axial Chrono
Omega Planet Ocean 600M Co-Axial Chrono
AU$ 8,572
Seller
Paul Zonjee Juweliers
25
NL
Rolex GMT-MASTER II  Tritium
Rolex GMT-MASTER II Tritium
AU$ 20,170
Seller
Uhren Schöfer GmbH
DE
Montblanc Meisterstück
Montblanc Meisterstück
AU$ 1,805
Seller
Private seller
 
HU
Lehmann Intemporal Window Date "Colours"
Lehmann Intemporal Window Date "Colours"
AU$ 13,455
Seller
Define Watches
AU
Omega Speedmaster 'Broad Arrow' automatic men's...
Omega Speedmaster 'Broad Arrow' automatic men's...
AU$ 3,914
Estimated price
Seller
Catawiki BV
 
Omega Seamaster Diver Chrono 300m Blue Waved Dial 2598.80
Omega Seamaster Diver Chrono 300m Blue Waved Dial 2598.80
AU$ 3,321
Seller
The Watch Culture
AU
Rolex Submariner
Rolex Submariner
AU$ 9,493
Seller
SWISSTIME.DK
 
DK
Swiss Military Cx Swiss Military 20000 Feet Diving Watch World...
Swiss Military Cx Swiss Military 20000 Feet Diving Watch World...
AU$ 4,435
Free shipping
Seller
Watchpartners
AU
Rolex Sea-Dweller Ref. 126600
Rolex Sea-Dweller Ref. 126600
AU$ 16,708
Seller
Steiner Maastricht
46
NL
Omega Seamaster Aqua Terra GMT
Omega Seamaster Aqua Terra GMT
AU$ 12,034
Seller
Paul Zonjee Juweliers
25
NL
Rolex Yacht-Master II 44 mm Steel
Rolex Yacht-Master II 44 mm Steel
AU$ 14,104
Seller
Lombard Perspectiva
RU
Rolex Daytona (White dial)
Rolex Daytona (White dial)
AU$ 19,396
Seller
Private seller
 
UK
Lehmann Intemporal Power Reserve Window Date Red Gold
Lehmann Intemporal Power Reserve Window Date Red Gold
AU$ 34,090
Seller
Define Watches
AU
Omega Seamaster – Planet Ocean XL – Men's Wristwatch
Omega Seamaster – Planet Ocean XL – Men's Wristwatch
AU$ 4,290
Estimated price
Seller
Catawiki BV
 
Omega Seamaster Planet Ocean 600m Co-Axial Orange Bezel
Omega Seamaster Planet Ocean 600m Co-Axial Orange Bezel
AU$ 4,475
Seller
The Watch Culture
AU
Breitling Navitimer Heritage
Breitling Navitimer Heritage
AU$ 4,320
Seller
Private seller
 
RO
Breitling Chronomat 41 Rosegold/Steel Full Set Unworn
Breitling Chronomat 41 Rosegold/Steel Full Set Unworn
AU$ 8,956
Seller
Private seller
 
BE
Tudor Black Bay Dark
Tudor Black Bay Dark
AU$ 5,040
Seller
SWISSTIME.DK
 
DK
Omega Speedmaster Reduced
Omega Speedmaster Reduced
AU$ 5,116
Seller
Paul Zonjee Juweliers
25
NL
IWC Portuguese Chronograph
IWC Portuguese Chronograph
AU$ 6,772
Seller
Private seller
 
PT
Rolex Rare S/S O/P UAE Air Force Pepsi Bezel GMT-Master...
Rolex Rare S/S O/P UAE Air Force Pepsi Bezel GMT-Master...
AU$ 156,817
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
54
UK
Rolex Sea-Dweller
Rolex Sea-Dweller
AU$ 23,331
Seller
Private seller
 
SI
Sinn UX (EZM 2B)
Sinn UX (EZM 2B)
AU$ 1,806
Seller
Private seller
 
DE
Ball for BMW Power Reserve
Ball for BMW Power Reserve
AU$ 2,619
Seller
Private seller
 
DE
Louis Moinet Tempograph
Louis Moinet Tempograph
AU$ 16,507
Seller
Private seller
 
UK
Chopard Mille Miglia GTS Powerreserve-Gent-2016
Chopard Mille Miglia GTS Powerreserve-Gent-2016
AU$ 5,569
Estimated price
Seller
Catawiki BV
 
Lehmann Intemporal Pointer Date
Lehmann Intemporal Pointer Date
AU$ 14,520
Seller
Define Watches
AU
Omega Seamaster Planet Ocean Titan
Omega Seamaster Planet Ocean Titan
AU$ 6,021
Seller
Private seller
 
AT
Baume & Mercier Classima XL Chronograph Executives
Baume & Mercier Classima XL Chronograph Executives
AU$ 1,942
Seller
Private seller
 
DE
Doxa Anti-Magnetic Chronograph
Doxa Anti-Magnetic Chronograph
AU$ 211
Seller
Private seller
 
HU
TAG Heuer Sport Elegance Chronometer Aut.  WG5113
TAG Heuer Sport Elegance Chronometer Aut. WG5113
AU$ 1,269
Seller
The Watch Culture
AU
Rolex Sea-Dweller Deepsea
Rolex Sea-Dweller Deepsea
AU$ 18,048
Seller
Private seller
 
DE
Montblanc 1858 Monopusher Chronograph Limited Edition
Montblanc 1858 Monopusher Chronograph Limited Edition
AU$ 20,386
Seller
Private seller
 
CH
Omega Seamaster Aqua Terra 15000 Gauss
Omega Seamaster Aqua Terra 15000 Gauss
AU$ 6,322
Seller
Paul Zonjee Juweliers
25
NL
Omega Constellation – Men's watch – Gold – 02/2000
Omega Constellation – Men's watch – Gold – 02/2000
AU$ 9,031
Estimated price
Seller
Catawiki BV
 
A. Lange & Söhne Savonette  ALS  1B,  14 Kt,  Top=Wie Neu,...
A. Lange & Söhne Savonette ALS 1B, 14 Kt, Top=Wie Neu,...
AU$ 7,376
Seller
Private seller
 
DE
Lehmann Intemporal Power Reserve Pointer Date
Lehmann Intemporal Power Reserve Pointer Date
AU$ 17,500
Seller
Define Watches
AU
Omega Seamaster Diver 300 M
Omega Seamaster Diver 300 M
AU$ 4,215
Seller
Private seller
 
DE
Audemars Piguet Royal Oak Rubens Barrichello II Limited...
Audemars Piguet Royal Oak Rubens Barrichello II Limited...
AU$ 89,551
Seller
Private seller
 
UK
Rolex Daytona
Rolex Daytona
AU$ 34,621
Seller
Private seller
 
IT
Breitling Chronomat Windrider MOP Dial A13352
Breitling Chronomat Windrider MOP Dial A13352
AU$ 3,526
Seller
The Watch Culture
AU

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.