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Omega Seamaster Planet Ocean Co-Axial Chronograph MINT
3 499 
Seller
Time Line
268
BE
TOP
Rolex Submariner Non Date Tropical Dial Stainless Steel 5513 -...
34 047 
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Xupes.com
235
UK
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Rolex Sky-Dweller Gelbgold / Krokoleder 326138
28 430 
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425
DE
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4 100 
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10
DE
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4 990 
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455
DE
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44 600 
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5201
DE
TOP
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3 290 
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349
DE
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15 400 
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Ranneaika
7
FI
TOP
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7 540 
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Zeitauktion GmbH
1560
DE
TOP
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23 900 
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Stephan Hermann GmbH
132
DE
Omega Constellation 35mm Co-Axial Rose gold 2011 FULLSET
3 090 
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Chrono Finland
83
FI
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Sinn 103 St Sa RB Classic Watch Sondermodell
2 450 
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56
DE
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13 300 
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GARCÍA JOYEROS
30
ES
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Rolex Daytona 116520 2014
21 000 
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MMC RIVIERA
7
MC
TOP
Rolex GMT Master II
14 490 
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Prestige Luxusuhren GmbH
5201
DE
Omega Constellation Co‑Axial 38 mm
3 200 
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Private Seller
FI
Panerai Luminor 1950 10 Days GMT Ceramica
12 500 
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7
FI
TOP
Omega Seamaster Aqua Terra Day-date Automatik Co-axial...
4 460 
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Zeitauktion GmbH
1560
DE
TOP
Chopard Superfast Mille Miglia GT XL Chronograph Classic Racing
3 750 
Free shipping
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Pawndeluxe
396
NL
TOP
Rolex Day-Date 36 18 kt Everose-Gold Ref. 118235 Choco...
25 520 
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Uhren2000 GmbH
425
DE
TOP
Rolex Daytona Chromalight Black Dial - 2016 - FULL SET
19 900 
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85
IT
TOP
Rolex Datejust SCAT/GAR art. Rz1131
4 162 
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Stroppiana SRL
352
IT
TOP
Rolex Daytona 116520 RRR NOS New Old Stock 2011
23 500 
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MMC RIVIERA
7
MC
TOP
Breitling Aerospace Avantage
1 750 
Free shipping
Seller
MANZANARES JOYERO
52
ES
Omega Speedmaster Ladies Chronograph
4 000 
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Private Seller
 
FI
Jaeger-LeCoultre Master Compressor Diving GMT
6 590 
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Ranneaika
7
FI
TOP
Omega Speedmaster Chronograph Automatik Herrenuhr 326.30.40.50...
2 860 
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Zeitauktion GmbH
1560
DE
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Ulysse Nardin 41 Maxi Marine Chronometer Power Reserve Display...
3 500 
Free shipping
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Pawndeluxe
396
NL
Omega Constellation C Date
950 
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Harri Asunta
14
FI
Omega De Ville Hour Vision Annual Calendar Red Gold
14 900 
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Kellokonttori
16
FI
TOP
Rolex Cellini Dual Time 50525 Everose-Gold Zifferblatt Silber
15 450 
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Uhren2000 GmbH
425
DE
TOP
Rolex Deep Sea 116660 D-Blue NOS
14 900 
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7
MC
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8 600 
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1099
NL
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3 250 
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Private Seller
 
FI
Panerai Radiomir Black Seal Automatic
4 690 
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7
FI
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3 340 
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1560
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3 500 
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396
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4 761 
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85
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4 941 
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594
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TOP
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9 490 
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18
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66
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7
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1560
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3 350 
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396
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EXPERTYCO
47
PL
TOP
Breitling Chronomat 44 B01 Rose Gold Black Dial Black Alligato...
13 950 
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674
BE
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14 392 
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305
US
TOP
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9 500 
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7
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TOP
Breitling Premier B01 Chronograph 42
5 230 
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116
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1 500 
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FI
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3 690 
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7
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1560
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1 650 
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396
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123
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6 750 
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116
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1 500 
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FI
TOP
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6 300 
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M.J.WATCHES
251
BE
TOP
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3 560 
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1560
DE
Revue Thommen 17061.6
780 
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Private Seller
 
FI
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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.