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Omega Speedmaster Dark Side of the Moon
TOP
Omega Speedmaster Dark Side of the Moon
6,602 
Free shipping
Seller
Przedsiębiorstwo Handlowe Usługowe
172
PL
Omega Seamaster 300 "Spectre" Limited Edition
TOP
Omega Seamaster 300 "Spectre" Limited Edition
8,968 
Free shipping
Seller
Przedsiębiorstwo Handlowe Usługowe
172
PL
Panerai Radiomir Chronograph 42 mm Ref. PAM00369
TOP
Panerai Radiomir Chronograph 42 mm Ref. PAM00369
5,620 
Seller
Uhren2000 GmbH
376
DE
Breitling Bentley Flying B
TOP
Breitling Bentley Flying B
6,853 
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Antonio Group
11
GI
Rolex Day-Date President Blue Dial Revision 2016 Mint Condition
TOP
Rolex Day-Date President Blue Dial Revision 2016 Mint Condition
15,686 
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Luxus Ritter
94
DE
Rado 56-H Chronometre, 1st Version, Very Rare
TOP
Rado 56-H Chronometre, 1st Version, Very Rare
6,962 
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Plus Ultra AG
5
CH
Rolex Lady Yachtmaster 18K Gelb Gold Automatic Service 10.2018
TOP
Rolex Lady Yachtmaster 18K Gelb Gold Automatic Service 10.2018
7,990 
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Timeless Watches GmbH
268
DE
Breitling Chronomat Evolution mit original Diamantlünette Full...
TOP
Breitling Chronomat Evolution mit original Diamantlünette Full...
5,999 
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Buxtehuder Uhrenbörse GmbH
517
DE
Rolex Yachtmaster Stahl Platin Herrenuhr 40 mm Rolesium...
TOP
Rolex Yachtmaster Stahl Platin Herrenuhr 40 mm Rolesium...
6,699 
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Uhrenkapital
363
DE
Rolex GMT-Master II 116759SARU june 2020 Rolex warranty
TOP
Rolex GMT-Master II 116759SARU june 2020 Rolex warranty
69,000 
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MMC RIVIERA
6
MC
Blancpain Fifty Fathoms 500 Fathoms GMT (Limited Edition)
TOP
Blancpain Fifty Fathoms 500 Fathoms GMT (Limited Edition)
19,900 
Free shipping
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Istock LTD
118
LV
Paul Picot Rattrapante Technicum Chronometer 4101
TOP
Paul Picot Rattrapante Technicum Chronometer 4101
3,995 
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T&N "Glücksschmiede" GmbH
783
DE
Omega Seamaster Railmaster Master Chronometer 220.12.40.20.01.001
TOP
Omega Seamaster Railmaster Master Chronometer 220.12.40.20.01.001
3,400 
Seller
Uhren2000 GmbH
376
DE
Rolex Datejust 41 mit Brillantlünette + schwarzem Dia Blatt
TOP
Rolex Datejust 41 mit Brillantlünette + schwarzem Dia Blatt
11,493 
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Luxus Ritter
94
DE
TAG Heuer Link
TOP
TAG Heuer Link
1,000 
Free shipping
Seller
Ducado Jóias, Lda
44
PT
Breitling For Bentley Special Edition Mark VI Edelstahl Platin
TOP
Breitling For Bentley Special Edition Mark VI Edelstahl Platin
3,790 
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Timeless Watches GmbH
268
DE
Rolex Sea-Dweller 50th Anniversary NEW 126600 year 2018
TOP
Rolex Sea-Dweller 50th Anniversary NEW 126600 year 2018
11,799 
Free shipping
Seller
Watchesnorte SL
130
ES
Rolex Men's 14K Solid Gold Oyster Perpetual 1005 Automatic,...
TOP
Rolex Men's 14K Solid Gold Oyster Perpetual 1005 Automatic,...
5,235 
Free shipping
Seller
GMTSKY
407
US
Rolex GMT-Master II 116758SARU with 2 years warranty
TOP
Rolex GMT-Master II 116758SARU with 2 years warranty
69,000 
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MMC RIVIERA
6
MC
Omega Seamaster Aqua Terra Diamonds
TOP
Omega Seamaster Aqua Terra Diamonds
7,750 
Free shipping
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Istock LTD
118
LV
Gérald Genta Arena Sport Retro men's SSPL10
TOP
Gérald Genta Arena Sport Retro men's SSPL10
1,895 
Free shipping
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Pawndeluxe
223
NL
Breitling Bentley Motors Special Purple Dial
TOP
Breitling Bentley Motors Special Purple Dial
3,950 
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Pawn Shop La Casa de los Empeños s.L
62
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Rolex Datejust II Diamonds Black Roman Diamond Dial + Strap
TOP
Rolex Datejust II Diamonds Black Roman Diamond Dial + Strap
13,972 
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Luxus Ritter
94
DE
Omega de Ville
Omega de Ville
3,300 
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Private Seller
 
FI
Mido Commander Icône , Herrenuhr Chronometer, Automatik
TOP
Mido Commander Icône , Herrenuhr Chronometer, Automatik
1,220 
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Juwelier Bucher GbR
329
DE
Hamilton Intra-Matic Auto Chrono
TOP
Hamilton Intra-Matic Auto Chrono
1,550 
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CANTELI JOYEROS SL
22
ES
Rolex Mens Oyster Precision "Air King" 5500 Automatic c.1968...
TOP
Rolex Mens Oyster Precision "Air King" 5500 Automatic c.1968...
3,490 
Free shipping
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GMTSKY
407
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Rolex Sea Dweller Red 126600
TOP
Rolex Sea Dweller Red 126600
12,500 
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MMC RIVIERA
6
MC
Perrelet First Class Ladies Open Heart MOP
TOP
Perrelet First Class Ladies Open Heart MOP
2,100 
Free shipping
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Istock LTD
118
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Breitling Chronomat Evolution 43mm Gold/Steel Gold Sub-dials -...
TOP
Breitling Chronomat Evolution 43mm Gold/Steel Gold Sub-dials -...
2,350 
Free shipping
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Pawndeluxe
223
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Omega De Ville Co-Axial Rose Gold
TOP
Omega De Ville Co-Axial Rose Gold
14,000 
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Pawn Shop La Casa de los Empeños s.L
62
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Seiko 2242 Chronometer Hi-Beat Ladies Grand Seiko Class
TOP
Seiko 2242 Chronometer Hi-Beat Ladies Grand Seiko Class
350 
Free shipping
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Continental Co.,Ltd.
10
JP
Omega Seamaster Diver 300 M
Omega Seamaster Diver 300 M
52,750 
Seller
Private Seller
 
FI
Ulysse Nardin Maxi Marine Diver Titanium and Gold
Ulysse Nardin Maxi Marine Diver Titanium and Gold
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Kellokonttori
14
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Sinn 103 St Sa RB Classic Watch Sondermodell
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Sinn 103 St Sa RB Classic Watch Sondermodell
2,450 
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Classic Watch
28
DE
Rolex Datejust
Rolex Datejust
8,500 
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Gellot Oy Ltd
 
FI
Rolex GMT-Master II 126710BLRO New sticked
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Rolex GMT-Master II 126710BLRO New sticked
16,500 
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MMC RIVIERA
6
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Hublot Big Bang Unico GMT Carbon
TOP
Hublot Big Bang Unico GMT Carbon
14,600 
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Istock LTD
118
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Hermès Clipper XL - Automatic Chronograph 44 mm Splendid - CP...
TOP
Hermès Clipper XL - Automatic Chronograph 44 mm Splendid - CP...
2,850 
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Pawndeluxe
223
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Rolex Daytona Cosmograph Sapphires baguette set Bezel 116589 SALV
Rolex Daytona Cosmograph Sapphires baguette set Bezel 116589 SALV
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13
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Rolex Submariner Tropical Dial Stainless Steel Men's 5513 - W5323
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Rolex Submariner Tropical Dial Stainless Steel Men's 5513 - W5323
34,175 
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Xupes.com
178
UK
Rolex Datejust SCAT/GAR art. Rz1131
TOP
Rolex Datejust SCAT/GAR art. Rz1131
4,060 
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Stroppiana SRL
318
IT
Omega De Ville Hour Vision Annual Calendar, Serviced
Omega De Ville Hour Vision Annual Calendar, Serviced
14,500 
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Kellokonttori
14
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Rolex Day-Date 36 President Yellow Gold
Rolex Day-Date 36 President Yellow Gold
9,750 
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Juwelier Burger, since 2001
811
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Rolex GMT-Master II 116758SARU
Rolex GMT-Master II 116758SARU
131,027 
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Watches & Jewellery of Bond Street Ltd
257
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Omega Dark Side Of The Moon  Black Black Deployante
TOP
Omega Dark Side Of The Moon Black Black Deployante
7,540 
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CONCEPT LUXURY
183
IT
Sinn 910 Jubiläum (Limited Edition)
TOP
Sinn 910 Jubiläum (Limited Edition)
5,500 
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Istock LTD
118
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Breitling Chronomat 41 Manufacture Movement AB014012.F554.378A
TOP
Breitling Chronomat 41 Manufacture Movement AB014012.F554.378A
3,500 
Free shipping
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Pawndeluxe
223
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Rolex Sky-Dweller Everose Gold 42mm 326935-0003
Rolex Sky-Dweller Everose Gold 42mm 326935-0003
37,512 
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13
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Rolex Submariner Stainless Steel Men's 1680 - COM1643
TOP
Rolex Submariner Stainless Steel Men's 1680 - COM1643
13,667 
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Xupes.com
178
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Breitling Bentley Flying B
Breitling Bentley Flying B
6,900 
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Helmut Seidl GmbH
11
DE
Rolex Explorer
Rolex Explorer
4,850 
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A. Grimmeissen Uhren An- und Verkauf
348
DE
Tudor Pelagos
Tudor Pelagos
2,650 
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Juwelier Burger, since 2001
811
NL
Rolex GMT-Master Vintage UAE Air Force 1675
Rolex GMT-Master Vintage UAE Air Force 1675
108,239 
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Watches & Jewellery of Bond Street Ltd
257
UK
Omega Seamaster Aqua Terra Annual Calendar, UNGETRAGEN, Ref...
Omega Seamaster Aqua Terra Annual Calendar, UNGETRAGEN, Ref...
4,590 
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chronopark GmbH
 
DE
Ulysse Nardin Marine Annual Calendar Monaco 2017 (Limited...
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Ulysse Nardin Marine Annual Calendar Monaco 2017 (Limited...
8,900 
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Istock LTD
118
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Rolex Datejust 36mm Stainless Steel Silver Rhodium Index Jubilee
TOP
Rolex Datejust 36mm Stainless Steel Silver Rhodium Index Jubilee
5,650 
Free shipping
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Pawndeluxe
223
NL
Rolex Daytona Cosmograph White gold 116509-0071
Rolex Daytona Cosmograph White gold 116509-0071
28,134 
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Premium Watches
13
FI
Rolex GMT-Master Gilt Gloss Underline Dial Stainless Steel...
TOP
Rolex GMT-Master Gilt Gloss Underline Dial Stainless Steel...
28,478 
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Xupes.com
178
UK
Breitling Chronomat Evolution
Breitling Chronomat Evolution
4,500 
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Helmut Seidl GmbH
11
DE
Omega Seamaster Co-Axial 600 m
Omega Seamaster Co-Axial 600 m
3,500 
Free shipping
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A. Grimmeissen Uhren An- und Verkauf
348
DE
Rolex Submariner Date
Rolex Submariner Date
5,550 
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Juwelier Burger, since 2001
811
NL
Rolex Explorer II Steve McQueen 1655
Rolex Explorer II Steve McQueen 1655
22,730 
Free shipping
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Watches & Jewellery of Bond Street Ltd
257
UK
Omega SPEEDMASTER MOONWATCH 44 MM MOONPHASE
TOP
Omega SPEEDMASTER MOONWATCH 44 MM MOONPHASE
6,560 
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CONCEPT LUXURY
183
IT
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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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