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Rolex Pearlmaster Datejust 69318
TOP
Rolex Pearlmaster Datejust 69318
$17,690
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Watches & Jewellery of Bond Street Ltd
235
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Chopard Two O Ten Tycoon
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Chopard Two O Ten Tycoon
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Omega Seamaster Planet Ocean 215.30.44.21.01.002
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Omega Seamaster Planet Ocean
$7,650
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Chopard Mille Miglia Power Reserve
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$4,499
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Rolex Datejust 41 Blue Index
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Omega Seamaster Planet Ocean Chronograph 215.90.46.51.99.001
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Omega Seamaster Planet Ocean Chronograph 215.90.46.51.99.001
$6,800
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Omega Seamaster Diver 300m Co-Axial 41mm Blue Steel - 212.30.4...
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Omega Seamaster Diver 300m Co-Axial 41mm Blue Steel - 212.30.4...
$2,989
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Rolex 116710BLNR GMT Master II Ceramic Black & Blue "Batman"...
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Omega Aquaterra 150M Omega Master Co-Axial 231.20.42.21.02.001...
Omega Aquaterra 150M Omega Master Co-Axial 231.20.42.21.02.001...
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Edox Limited Edition Miss GEICO Racing Chronoffshore-One
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Omega SPEEDMASTER SPEEDMASTER '57 OMEGA CO-AXIAL CHRONOGRAPH
$6,250
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Omega Constellation Pie Pan 18K Gold Automatic Service 09/18
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Breitling Colt Chronograph Automatic - A1338811/C914-173A
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$4,050
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Omega Speedmaster Moonwatch Moonphase Chronograph Black Steel...
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Rolex 1680 Submariner RED MK IV Circa 1970 SS (29570)
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Omega Diver 300M Co-Axial 41mm 212.30.41.20.01.003
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Omega Sea Diver 300 blue dial 42 mm Co-Axial Chronometer
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48
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Omega Planet Ocean 600M 215.92.44.21.99.001
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Rolex Datejust 41 mm 126334 rhodium jubilee band
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Omega Seamaster Planet Ocean Co-Axial Black 37.5mm
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Omega Speedmaster 38 Chronograph Black Steel 38mm - 324.30.38....
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$7,300
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Omega Planet Ocean GMT - Titanium - Factory Warranty - NEW
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Breitling Superocean II 44 - A17392D7/BD68-162A
$3,050
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Omega Seamaster Diver 300m Co-Axial 41mm Black Steel -...
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Omega 2504.75.00 Seamaster Aqua Terra Co-Axial Master Mother...
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Rolex Datejust 41mm  Navy Blue  Index Jubilee 126334
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$9,095
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Omega Aqua Terra 150m Co-axial GMT Steel and Rose Gold...
Omega Aqua Terra 150m Co-axial GMT Steel and Rose Gold...
$9,500
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Omega Seamaster Planet Ocean Liquidmetal Blue Titanium 42
Omega Seamaster Planet Ocean Liquidmetal Blue Titanium 42
$4,880
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The Luxury Well
149
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Chopard Mille Miglia
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$7,199
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Ulysse Nardin Marine Chronometer Manufacture
Ulysse Nardin Marine Chronometer Manufacture
$28,000
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Longines Ultra-Chron Factory Service & Warranty & Certificate
Longines Ultra-Chron Factory Service & Warranty & Certificate
$2,222
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Horology 411
 
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Breitling Super Avenger II - A1337111/BC28-168A
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Breitling Super Avenger II - A1337111/BC28-168A
$4,080
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Chrono Hour Passion
197
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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
$3,989
Free shipping
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WatchShopping.com Inc.
306
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Rolex 326934 Sky Dweller Steel Black Dial UNWORN (29721)
Rolex 326934 Sky Dweller Steel Black Dial UNWORN (29721)
$17,500
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European Watch Company
167
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Rolex Datejust 41mm 126334 slate Roman  dial oyster band
Rolex Datejust 41mm 126334 slate Roman dial oyster band
$8,985
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Harley's Time LLC
176
US
Omega Constellation Co-Axial Womens Watch 123.15.27.20.55.002
Omega Constellation Co-Axial Womens Watch 123.15.27.20.55.002
$5,500
Free shipping
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Exquisite Timepieces
21
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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