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Ball Engineer Hydrocarbon AeroGMT II 42mm
R 51 836
Seller
Vaessen Juweliers
22
NL
TOP
A. Lange & Söhne Taschenuhr A. Lange & Söhne Gold savonnette...
R 163 962
Free shipping
Seller
Antiquitäten carsten berger
9
DE
TOP
Patek Philippe Very rare antique 1875 Split Chronograf
R 199 370
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EVW EDYTA KAISER
32
PL
TOP
Breitling Emergency K56121.1 Yellow Gold - Box & Papers 2004
R 295 647
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Mark Worthington Jewellers
204
UK
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Rolex Lady-Datejust Pearlmaster 29
R 722 671
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Chronometrie Stäuble AG
18
CH
Breitling Navitimer
R 54 000
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The Watch Girl
ZA
TOP
Rolex OYSTER PERPETUAL CHRONOMETER 18K GOLD HONEYCOMB WABENBLATT
R 127 438
Seller
Timeless Watches GmbH
353
DE
TOP
Omega De Ville Hour Vision 18K Redgold NEW
R 160 932
Seller
Timeless Watches & Jewellery AG
611
LI
TOP
Rolex Daytona Chocolate Everose 2019 Full Set Ref.116505
R 493 641
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Juwelier Pieter Jacobs
239
NL
TOP
Casio GMW-B5000GD-9 G-SHOCK
R 8 756
Seller
First Advanced Watches
100
ES
TOP
Breitling Edition Special Limited A 25 Exemplaires - G34360
R 1 594 964
Free shipping
Seller
Pawndeluxe
402
NL
TOP
Omega Seamaster Planet Ocean Master 43,5 PyeongChang 2018 Limited
R 87 085
Seller
Uhren2000 GmbH
428
DE
TOP
Eberhard & Co. Chrono 120 ÉME Aniversario Edicion Limitada
R 138 762
Seller
CANTELI JOYEROS SL
42
ES
TOP
Breguet Secret de la Reine, new, official retail price 90.000 CHF
R 751 583
Seller
Chronometrie Stäuble AG
18
CH
Omega Seamaster Planet Ocean
R 47 000
Seller
The Watch Girl
ZA
TOP
Rolex Lady Datejust 18K Gold Weissgold Automatic Automatik
R 111 488
Seller
Timeless Watches GmbH
353
DE
Omega Seamaster Aqua Terra Co-Axial Annual Calendar 18K Gold
R 198 999
Seller
The Diamond Channel
ZA
TOP
Rolex Oyster Perpetual Date Vintage 34mm Yellow Gold Ref. 1503
R 124 407
Seller
Orologeria Duomo Milano
109
IT
Breitling for Bentley
R 56 831
Seller
Zeidmans
 
US
TOP
Breitling Navitimer Triple Date Moonphase Chrono - A1938021/BD...
R 94 103
Free shipping
Seller
Pawndeluxe
402
NL
Breitling Transocean Chronograph
R 83 736
Seller
Titlis Luxury trade ag
6
NL
Rolex DAY-DATE Platinum | 118366 | Baguette Bezel | Full Set |
R 925 079
Seller
nobeluhren-store.de
23
DE
TOP
Rolex Lady-Datejust
R 295 559
Seller
Chronometrie Stäuble AG
18
CH
Rolex Datejust
R 251 207
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
631
DE
Chopard 161926-5001 L.U.C Quattro - 9 Day Power Reserve
R 262 461
Free shipping
Seller
Watch Club
91
UK
Breitling Starliner
R 119 000
Seller
The Diamond Channel
ZA
Rolex Datejust 41 Ref. 126334
R 134 774
Seller
Steiner Maastricht
331
NL
Breitling Bentley Motors T Speed 48mm A25365 Special Edition...
R 83 826
Seller
Zeidmans
 
US
TOP
Chopard Superfast Mille Miglia GT XL Chronograph Classic Racing
R 59 811
Free shipping
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Pawndeluxe
402
NL
Oris Artelier Chronometer, Date
R 23 127
Seller
Basile Goldiamonds
17
IT
Rolex DAYTONA | 116506 | Platin Ice Blue | Full Set 2015 | LC100
R 972 928
Seller
nobeluhren-store.de
23
DE
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Rolex Cellini Prince, new, official retail price 16.800 CHF
R 144 418
Seller
Chronometrie Stäuble AG
18
CH
Patek Philippe 10 Days
R 677 860
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
631
DE
Rolex 1002 Oyster Perpetual 34mm - 1968 Chronometer Certificate
R 82 742
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Watch Club
91
UK
TAG Heuer Grand Carrera
R 108 999
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The Diamond Channel
ZA
Breitling Bentley 6.75 Ref. A44362
R 65 394
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Steiner Maastricht
331
NL
Chanel J12 Chronograph 9P Baguette Diamond Custom シャネルJ12 アフターダイヤ
R 263 519
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G-BALLER
6
JP
TOP
Ulysse Nardin 41 Maxi Marine Chronometer Power Reserve Display...
R 55 824
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Pawndeluxe
402
NL
Rolex Submariner Date Reference 16610 T
R 126 435
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19
US
Rolex DAY-DATE 40 | 228206 | Platin Ice Blue | Full Set 2018 |...
R 781 532
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nobeluhren-store.de
23
DE
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Rolex Lady-Datejust
R 75 823
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Chronometrie Stäuble AG
18
CH
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R 235 257
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A. Grimmeissen Uhren An- und Verkauf
631
DE
Breitling :大進洋行
R 89 554
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Daisinyoko & Co.
 
JP
Breitling Navitimer 1461
R 106 400
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The Diamond Channel
ZA
Rolex Datejust 126334
R 132 382
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Orologi360
30
IT
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R 233 975
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G-BALLER
6
JP
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Omega De Ville Prestige Co-Axial 18K Red Gold 36.5 MM Caliber...
R 51 836
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Pawndeluxe
402
NL
Rolex Datejust II 116333
R 164 594
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Watches & Jewellery of Bond Street Ltd
370
UK
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R 462 540
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nobeluhren-store.de
23
DE
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Rolex Lady-Datejust
R 223 928
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18
CH
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R 550 262
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631
DE
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...
R 79 122
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Daisinyoko & Co.
 
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Breitling Transocean Chronograph Unitime
R 99 999
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The Diamond Channel
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Tudor Black Bay Chrono 79350
R 49 372
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19
US
Audemars Piguet Royal Oak Offshore Chrono Custom ロイヤルオーク オフショア...
R 337 642
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G-BALLER
6
JP
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Breitling Classic Navitimer 40 Automatic Chronograph 2Tone...
R 50 241
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Pawndeluxe
402
NL
Rolex Day-Date 18239
R 217 976
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Watches & Jewellery of Bond Street Ltd
370
UK
Rolex 118209 | Weißgold | Oysterband | LC100 | Rolex Service
R 271 144
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nobeluhren-store.de
23
DE
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Breguet Marine
R 173 331
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Chronometrie Stäuble AG
18
CH
Rolex GMT Master II
R 220 105
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A. Grimmeissen Uhren An- und Verkauf
631
DE
Breitling 時計 腕時計 メンズ腕時計 ブライトリング ナビタイマー 1 B01 クロノグラフ 46...
R 79 122
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Daisinyoko & Co.
 
JP
Omega Constellation Ladies
R 98 999
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The Diamond Channel
ZA
Breitling Transocean Chrono Unitime
R 98 808
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M.Dodt GmbH & Co. KG
21
DE
Breitling Avenger Hurricane Military World Limited 1000Pcs Model
R 76 497
Seller
G-BALLER
6
JP
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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.