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Patek Philippe Very rare antique 1875 Split Chronograf
Rp. 199,697,120
Seller
EVW EDYTA KAISER
32
PL
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A. Lange & Söhne Taschenuhr A. Lange & Söhne Gold savonnette...
Rp. 164,230,912
Free shipping
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Antiquitäten carsten berger
9
DE
TOP
Breitling Emergency K56121.1 Yellow Gold - Box & Papers 2004
Rp. 296,131,424
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Mark Worthington Jewellers
204
UK
TOP
Ball Engineer Hydrocarbon AeroGMT II 42mm
Rp. 51,921,252
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Vaessen Juweliers
22
NL
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Rolex Lady-Datejust
Rp. 246,014,992
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Chronometrie Stäuble AG
18
CH
Omega Seamaster Planet Ocean 215.33.44.21.03.001 S/s 43.5mm...
Rp. 61,193,488
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R&R Watches, Inc.
36
US
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
Rp. 39,140,636
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Classic Watch
56
DE
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Casio GMW-B5000GD-9 G-SHOCK
Rp. 8,770,697
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First Advanced Watches
100
ES
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Breitling Edition Special Limited A 25 Exemplaires - G34360
Rp. 1,597,576,960
Free shipping
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Pawndeluxe
402
NL
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Omega Seamaster Planet Ocean Master 43,5 PyeongChang 2018 Limited
Rp. 87,227,704
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Uhren2000 GmbH
428
DE
TOP
Eberhard & Co. Chrono 120 ÉME Aniversario Edicion Limitada
Rp. 138,989,200
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CANTELI JOYEROS SL
42
ES
TOP
Rolex Oyster Perpetual Date Vintage 34mm Yellow Gold Ref. 1503
Rp. 124,611,008
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Orologeria Duomo Milano
109
IT
Ball Engineer Master II Diver COSC rubber strap black dial
Rp. 38,694,208
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JOSEPH GANN JEWELERS LLC
13
US
TOP
Breguet Reine de Naples
Rp. 303,934,944
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Chronometrie Stäuble AG
18
CH
Rolex DAY-DATE | 18238 | Box & Certificate | Rolex Service 2018
Rp. 223,660,784
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nobeluhren-store.de
23
DE
Rolex Datejust 41 Ref. 126334
Rp. 134,995,248
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Steiner Maastricht
331
NL
Chopard 161926-5001 L.U.C Quattro - 9 Day Power Reserve
Rp. 262,891,280
Free shipping
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Watch Club
91
UK
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Breitling Navitimer Triple Date Moonphase Chrono - A1938021/BD...
Rp. 94,257,040
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Pawndeluxe
402
NL
Rolex Daytona 18 kt Gelbgold
Rp. 551,164,096
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A. Grimmeissen Uhren An- und Verkauf
631
DE
Rolex Submariner Date Reference 16610 T
Rp. 126,642,056
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Guarded Crown
19
US
Breitling :大進洋行
Rp. 89,701,056
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Daisinyoko & Co.
 
JP
Rolex Datejust 1601
Rp. 401,020,576
Free shipping
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Watches & Jewellery of Bond Street Ltd
371
UK
TOP
Hublot Classic Fusion Ultra-Thin 45
Rp. 246,014,992
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Chronometrie Stäuble AG
18
CH
Rolex DAY-DATE Platinum | 118366 | Baguette Bezel | Full Set |
Rp. 926,594,624
Seller
nobeluhren-store.de
23
DE
Breitling Bentley 6.75 Ref. A44362
Rp. 65,500,660
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Steiner Maastricht
331
NL
Rolex 1002 Oyster Perpetual 34mm - 1968 Chronometer Certificate
Rp. 82,877,584
Free shipping
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91
UK
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Ulysse Nardin 41 Maxi Marine Chronometer Power Reserve Display...
Rp. 55,915,196
Free shipping
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Pawndeluxe
402
NL
Rolex Datejust
Rp. 235,642,608
Free shipping
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A. Grimmeissen Uhren An- und Verkauf
631
DE
Rolex Datejust 126334
Rp. 132,598,888
Seller
Orologi360
30
IT
Omega コンステレーション コーアクシャル 腕時計123.25.38.22.02.001 自動巻 K18PG SSピンク...
Rp. 79,251,336
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Daisinyoko & Co.
 
JP
Rolex Daytona 116589SACI
Rp. 1,416,939,520
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Watches & Jewellery of Bond Street Ltd
371
UK
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Tiffany Atlas 42, new, official retail price 16.200 CHF
Rp. 130,247,488
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Chronometrie Stäuble AG
18
CH
Rolex 118209 | Weißgold | Oysterband | LC100 | Rolex Service
Rp. 271,588,096
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nobeluhren-store.de
23
DE
Tudor Black Bay Chrono 79350
Rp. 49,452,876
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19
US
Omega Seamaster Diver 300 M Full Set
Rp. 61,506,712
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LUXUS-PORT
127
DE
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Omega De Ville Prestige Co-Axial 18K Red Gold 36.5 MM Caliber...
Rp. 51,921,252
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402
NL
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Rp. 251,618,384
Free shipping
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631
DE
Breitling Chronomat Airborne 44 AB01154G/BD13 v.3/2018
Rp. 84,511,824
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113
DE
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JP
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Rp. 355,571,584
Free shipping
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371
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Rolex Lady-Datejust
Rp. 72,327,536
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18
CH
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Rp. 255,612,320
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DE
Omega Seamaster Planet Ocean
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DE
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Rp. 47,927,312
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DE
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Rp. 50,323,676
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Rp. 678,970,240
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Rp. 73,328,784
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Rp. 668,367,616
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371
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Rp. 90,499,928
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Rolex DAY-DATE 40 | 228206 | Platin Ice Blue | Full Set 2018 |...
Rp. 782,812,736
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nobeluhren-store.de
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DE
Breitling Crosswind Racing
Rp. 51,921,252
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26
DE
Omega Seamaster Diver 300 M - Exclusiv Armband + Papiere
Rp. 27,158,810
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127
DE
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Omega Seamaster Olympic Games London Co-Axial Limited Edition
Rp. 46,329,736
Free shipping
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NL
Rolex GMT Master II
Rp. 220,465,616
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A. Grimmeissen Uhren An- und Verkauf
631
DE
TAG Heuer Monaco Ref.: CW2118 limitierte Auflage
Rp. 63,743,320
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DE
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JP
Rolex Day-Date Oysterquartz 19018
Rp. 195,163,360
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Watches & Jewellery of Bond Street Ltd
371
UK
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Rolex Datejust 36
Rp. 289,527,328
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Chronometrie Stäuble AG
18
CH
Rolex DAYTONA | 116506 | Platin Ice Blue | Full Set 2015 | LC100
Rp. 974,521,984
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nobeluhren-store.de
23
DE
Rolex Explorer II 16550 punched papers 1989 & revision 2011
Rp. 190,111,664
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MYTHICWATCH
 
FR
Breitling Galactic 41
Rp. 45,530,944
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Leihhaus Lohmann
26
DE
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Hermès Clipper XL Ø 44 mm Automatic Chronograph - CP1910
Rp. 36,744,272
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NL
Rolex GMT Master II
Rp. 166,148,016
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A. Grimmeissen Uhren An- und Verkauf
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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.