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Breitling Super Avenger II Chronograph Mens Watch A1337111/BC2...
TOP
Breitling Super Avenger II Chronograph Mens Watch A1337111/BC2...
$3,845
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Omega Speedmaster HB-SIA
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Rolex 16550 Explorer II with RARE Transitional Cream Rail Dial...
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Rolex 16550 Explorer II with RARE Transitional Cream Rail Dial...
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Ulysse Nardin Marine Chronometer Automatic Mens Watch 1183-126...
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Rolex Datejust 126334
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Omega Speedmaster Moonwatch Dark Side of the Moon Black...
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Omega Speedmaster Moonwatch Dark Side of the Moon Black...
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Omega Speedmaster Dark Side of the Moon DSOM 44mm NEW 2018
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Ball WATCH ENGINEER HYDROCARBON AIRBORNE MEN'S 42MM WATCH...
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Rolex Oyster Perpetual Day-Date President 18038 Mens Watch
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Breitling Transocean Unitime Pilot
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Ulysse Nardin Maxi Diver Black Dial Automatic Mens Watch...
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Omega Seamaster Aqua Terra 150M Master Chronometer Blue Steel...
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Omega Seamaster Aqua Terra 150M Master Chronometer Blue Steel...
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Hermès Apple Single Tour 38mm Barenia Fauve Calfskin Band...
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Rolex Gmt-Master II 16710 Pepsi Mens Watch Box Papers
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Breitling Chronomat Evolution A13356 Automatic 44mm Chronograph
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Breitling Chronomat Evolution A13356 Automatic 44mm Chronograph
$3,399
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Rolex Datejust 41mm 126334 silver dial oyster band
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Breitling B13050 Chronomat Chronograph SS / 18K Blue Dial 39MM...
Breitling B13050 Chronomat Chronograph SS / 18K Blue Dial 39MM...
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18K ROSE GOLD 40MM DAYTONA COSMOGRAPH MODEL 116505
18K ROSE GOLD 40MM DAYTONA COSMOGRAPH MODEL 116505
$29,995
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Omega Speedmaster Moonwatch Dark Side of the Moon "Black...
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Ulysse Nardin Maxi Marine Diver
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$3,250
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Breitling Chronomat Evolution Rose Gold and Stainless Steel...
Breitling Chronomat Evolution Rose Gold and Stainless Steel...
$4,300
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Ulysse Nardin Monaco Yacht Show 2010 LIMITED EDITION
Ulysse Nardin Monaco Yacht Show 2010 LIMITED EDITION
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Rolex Oyster Perpetual Milgauss Custom PVD 116400
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Rolex Oyster Perpetual Milgauss Custom PVD 116400
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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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