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TAG Heuer Carrera Calibre HEUER 02 Tourbillon COSC 45mm Mens...
TOP
TAG Heuer Carrera Calibre HEUER 02 Tourbillon COSC 45mm Mens...
$13,200
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luxuryfreeshop
110
US
Doxa GRANDE METRE BLUE PLANET LIMITED EDITION 800PCS WORLD
TOP
Doxa GRANDE METRE BLUE PLANET LIMITED EDITION 800PCS WORLD
$3,538
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Przedsiębiorstwo Handlowe Usługowe
102
PL
Omega Seamaster Diver 300 M
TOP
Omega Seamaster Diver 300 M
$3,500
Free shipping
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SLS TIME
92
US
Omega Seamaster Diver 300 M Chronometer Co-Axial Blue Dial
Omega Seamaster Diver 300 M Chronometer Co-Axial Blue Dial
$2,800
Seller
Koosh Jewelers
 
US
Rolex Yacht-Master 16622  SS/Plat. 40mm
Rolex Yacht-Master 16622 SS/Plat. 40mm
$6,495
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Angel Timepieces Inc.
 
US
Breitling Navitimer World
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Breitling Navitimer World
$4,650
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Brilliance and Grace
55
US
Panerai PAM01024  Luminor Submersible Automatic Mens 44mm XXX...
Panerai PAM01024 Luminor Submersible Automatic Mens 44mm XXX...
$7,200
Seller
Luxury Discount Store
 
US
Omega Seamaster
Omega Seamaster
$3,199
Seller
Chronostore
 
US
Breitling Transocean Unitime Pilot
Breitling Transocean Unitime Pilot
$7,950
Seller
Aaron Faber Gallery
 
US
Omega Constellation Chronometer Stainless Steel Watch
Omega Constellation Chronometer Stainless Steel Watch
$1,599
Free shipping
Seller
Avital & Co Jewelry
5
US
Rolex Day-Date President Pink MOP Roman  Diamond Dial Bezel 18038
TOP
Rolex Day-Date President Pink MOP Roman Diamond Dial Bezel 18038
$14,999
Seller
Watch My Diamonds
105
US
Omega Seamaster Planet Ocean
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Omega Seamaster Planet Ocean
$4,950
Free shipping
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SLS TIME
92
US
Omega De Ville St. Moritz Chronometer Co-Axial
Omega De Ville St. Moritz Chronometer Co-Axial
$3,600
Seller
Crown Timepieces
 
US
Omega Seamaster 300 Black Steel 41mm - 233.30.41.21.01.001
TOP
Omega Seamaster 300 Black Steel 41mm - 233.30.41.21.01.001
$4,049
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WatchShopping.com Inc.
54
US
Omega SPEEDMASTER SPEEDMASTER '57 OMEGA CO-AXIAL CHRONOGRAPH
TOP
Omega SPEEDMASTER SPEEDMASTER '57 OMEGA CO-AXIAL CHRONOGRAPH
$6,250
Free shipping
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Brilliance and Grace
55
US
Omega 232.30.44.22.01.001 OMEGA SEAMASTER PLANET OCEAN 600 M ...
Omega 232.30.44.22.01.001 OMEGA SEAMASTER PLANET OCEAN 600 M ...
$4,699
Seller
Luxury Discount Store
 
US
Breitling Super Ocean II
Breitling Super Ocean II
$1,999
Seller
Chronostore
 
US
Rolex Yacht-Master II White Dial 18K Yellow Gold Oyster Bracelet
Rolex Yacht-Master II White Dial 18K Yellow Gold Oyster Bracelet
$30,999
Seller
Rafaello & Co.
 
US
Omega Seamaster Diver Co-Axial Chronograph Watch
Omega Seamaster Diver Co-Axial Chronograph Watch
$4,999
Free shipping
Seller
Avital & Co Jewelry
5
US
Breitling Navitimer Limited Edition
Breitling Navitimer Limited Edition
$7,900
Free shipping
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Joyce's Fine Jewelry
 
US
Omega Speedmaster Racing
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Omega Speedmaster Racing
$3,300
Free shipping
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SLS TIME
92
US
Omega Seamaster Diver 300 M Black dial 212.30.41.20.01.003
Omega Seamaster Diver 300 M Black dial 212.30.41.20.01.003
$2,745
Seller
Harley's Time LLC
85
US
Rolex Datejust 41Dark Rhodium Steel/18k White Gold Dia 41mm -...
TOP
Rolex Datejust 41Dark Rhodium Steel/18k White Gold Dia 41mm -...
$10,539
Free shipping
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WatchShopping.com Inc.
54
US
Omega Seamaster Planet Ocean
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Omega Seamaster Planet Ocean
$7,650
Free shipping
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Brilliance and Grace
55
US
Omega 32632405006001 Omega Speedmaster Racing Mens Watch...
Omega 32632405006001 Omega Speedmaster Racing Mens Watch...
$3,800
Seller
Luxury Discount Store
 
US
Omega Constellation
Omega Constellation
$6,299
Seller
Chronostore
 
US
Rolex Sky-Dweller 42mm Oyster Perpetual 18k Rose Gold 326935
Rolex Sky-Dweller 42mm Oyster Perpetual 18k Rose Gold 326935
$41,900
Seller
Rafaello & Co.
 
US
Ulysse Nardin Maxi Marine Chronometer
TOP
Ulysse Nardin Maxi Marine Chronometer
$19,400
Seller
Metals In Time
5
US
Breitling Chronomat 44
Breitling Chronomat 44
$4,200
Free shipping
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Joyce's Fine Jewelry
 
US
Omega Speedmaster Professional Moonwatch
TOP
Omega Speedmaster Professional Moonwatch
$7,600
Free shipping
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SLS TIME
92
US
Rolex Datejust 41mm 126334 silver dial oyster band
Rolex Datejust 41mm 126334 silver dial oyster band
$8,485
Seller
Harley's Time LLC
85
US
Rolex Datejust 41 Blue Steel/18k White Gold Dia 41mm - 126334
TOP
Rolex Datejust 41 Blue Steel/18k White Gold Dia 41mm - 126334
$10,539
Free shipping
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WatchShopping.com Inc.
54
US
Omega Speedmaster Racing
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Omega Speedmaster Racing
$6,200
Free shipping
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Brilliance and Grace
55
US
Omega 212.30.44.50.03.001 Omega Men's Diver 300 M Co-Axial...
Omega 212.30.44.50.03.001 Omega Men's Diver 300 M Co-Axial...
$6,000
Seller
Luxury Discount Store
 
US
Breitling Chronomat
Breitling Chronomat
$5,999
Seller
Chronostore
 
US
Rolex GMT-Master II Black Dial 18K Yellow Gold Oyster Bracelet
Rolex GMT-Master II Black Dial 18K Yellow Gold Oyster Bracelet
$26,299
Seller
Rafaello & Co.
 
US
Breitling Navitimer 01
Breitling Navitimer 01
$11,500
Seller
BlackTagWatches
65
US
Omega Speedmaster Dark Side of the Moon Black Black 311.92.44....
Omega Speedmaster Dark Side of the Moon Black Black 311.92.44....
$10,600
Seller
Royal Time
49
US
Omega Seamaster Planet Ocean Olympic Pyeongchang 2018 Special
TOP
Omega Seamaster Planet Ocean Olympic Pyeongchang 2018 Special
$5,600
Free shipping
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SLS TIME
92
US
F.P.Journe Chronometre Bleu Tantalum Blue Dial (28789)
F.P.Journe Chronometre Bleu Tantalum Blue Dial (28789)
$29,500
Seller
European Watch Company
134
US
Rolex Sea-Dweller Red
TOP
Rolex Sea-Dweller Red
$13,995
Free shipping
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AJ Watches
119
US
Omega Speedmaster HB-SIA
TOP
Omega Speedmaster HB-SIA
$5,730
Free shipping
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Brilliance and Grace
55
US
Omega 23290422103001 Omega Seamaster Planet Ocean 600M...
Omega 23290422103001 Omega Seamaster Planet Ocean 600M...
$5,794
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Luxury Discount Store
 
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Omega Seamaster
Omega Seamaster
$6,799
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Chronostore
 
US
Rolex Day-Date II Black Dial 18K White Gold / President II
Rolex Day-Date II Black Dial 18K White Gold / President II
$33,999
Seller
Rafaello & Co.
 
US
Rolex Datejust 41 Black Steel/18k White Gold Dia 41mm - 126334
TOP
Rolex Datejust 41 Black Steel/18k White Gold Dia 41mm - 126334
$10,539
Free shipping
Seller
WatchShopping.com Inc.
54
US
Omega Speedmaster Moonwatch Co-Axial Chronograph Automatic...
Omega Speedmaster Moonwatch Co-Axial Chronograph Automatic...
$8,900
Seller
Royal Time
49
US
Omega Seamaster Planet Ocean
TOP
Omega Seamaster Planet Ocean
$8,590
Free shipping
Seller
SLS TIME
92
US
Omega De Ville Chronoscope Rattrapante 422.10.44.51.06.001
Omega De Ville Chronoscope Rattrapante 422.10.44.51.06.001
$5,695
Free shipping
Seller
J A Meyer Jewelry & Watches, inc
31
US
Omega Seamaster Aqua Terra
TOP
Omega Seamaster Aqua Terra
$3,395
Free shipping
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AJ Watches
119
US
Omega Speedmaster Racing
TOP
Omega Speedmaster Racing
$6,000
Free shipping
Seller
Brilliance and Grace
55
US
Omega 212.30.41.20.03.001 Omega Seamaster Mens Auto Watch Blue...
Omega 212.30.41.20.03.001 Omega Seamaster Mens Auto Watch Blue...
$4,400
Seller
Luxury Discount Store
 
US
Omega Seamaster
Omega Seamaster
$5,599
Seller
Chronostore
 
US
Rolex 116300 Stainless Steel PVD Datejust 2 w/ Black Dial
Rolex 116300 Stainless Steel PVD Datejust 2 w/ Black Dial
$12,000
Seller
Rafaello & Co.
 
US
Rolex Chronometer Vintage 1940s 18k Gold 4009 Original Manual...
TOP
Rolex Chronometer Vintage 1940s 18k Gold 4009 Original Manual...
$7,565
Seller
GMTSKY
342
US
Omega DeVille Tresor 18KT Sedna Rose Gold Mens Watch 432.53.40...
Omega DeVille Tresor 18KT Sedna Rose Gold Mens Watch 432.53.40...
$8,695
Seller
Royal Time
49
US
Omega Seamaster Diver 300 M
TOP
Omega Seamaster Diver 300 M
$3,300
Free shipping
Seller
SLS TIME
92
US
Omega Seamaster Diver 300 M
Omega Seamaster Diver 300 M
$2,950
Seller
Henne Jewelers
 
US
Omega Speedmaster Solar Impulse GMT Chrono 321.90.44.52.01.001
Omega Speedmaster Solar Impulse GMT Chrono 321.90.44.52.01.001
$5,495
Free shipping
Seller
J A Meyer Jewelry & Watches, inc
31
US
Omega Speedmaster Racing
TOP
Omega Speedmaster Racing
$5,999
Free shipping
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Brilliance and Grace
55
US
TAG Heuer WAR5011.BA0723 TAG HEUER CARRERA CALIBRE 8 GMT MENS...
TAG Heuer WAR5011.BA0723 TAG HEUER CARRERA CALIBRE 8 GMT MENS...
$2,762
Seller
Luxury Discount Store
 
US
Omega Constellation
Omega Constellation
$16,199
Seller
Chronostore
 
US
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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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