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Rolex Daytona 116509 Unworn White gold 40mm Automatic
TOP
Rolex Daytona 116509
27 566 
Free shipping
Verified Dealer
470
UK
Chopard L.U.C 161926-5001 Rose gold 43mm Manual winding
TOP
Chopard 161926-5001 L.U.C Quattro - 9 Day Power Reserve
17 678 
Free shipping
Verified Dealer
119
UK
Omega Seamaster Planet Ocean 232.30.42.21.01.001 Unworn Steel 42mm Automatic
TOP
Omega SEAMASTER PLANET OCEAN 600M CO-AXIAL 8500 NEW FULL SET
4 767 
Verified Dealer
97
PL
Omega Seamaster Planet Ocean 215.92.46.22.01.004 New Ceramic 45.5mm Automatic
TOP
Omega 215.92.46.22.01.004 SEAMASTER
6 589 
Verified Dealer
19
HK
Rolex Day-Date 36 118139 New White gold 36mm Automatic
TOP
Rolex Day-Date White Gold Cherry Dial NEW 118139
17 950 
Verified Dealer
708
NL
Rolex Datejust 1601 Very good Yellow gold 36mm Automatic
TOP
Rolex DATEJUST 1601 18K YELLOW GOLD 1969
5 300 
Free shipping
Verified Dealer
68
DE
Breitling Superocean A13311C9/BF98/225S/A18S.1 New Steel 42mm Automatic
Breitling Superocean Chronograph 42
3 441 
Verified Dealer
258
IT
Breitling 634360 Very good Steel 44mm Automatic
TOP
Breitling Edition Special Limited A25 Exemplaires - G34360
100 000 
Free shipping
Verified Dealer
555
NL
Tudor Black Bay Bronze 79250BM Unworn Bronze 43mm Automatic
Tudor Black Bay 79250BM
2 800 
Verified Dealer
2136
MC
Rolex GMT-Master II 16713 Good Gold/Steel 40mm Automatic
TOP
Rolex GMT Master II 16713 Tigerauge Oysterband S-Serie...
10 999 
Verified Dealer
584
DE
Sinn 103 103.0619 New Steel 41mm Automatic
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
2 450 
Verified Dealer
74
DE
Breitling Transocean Unitime Pilot AB0510U6/BC26/159A New Steel 46mm Automatic
TOP
Breitling Transocean Unitime Pilot
7 100 
Verified Dealer
1420
ES
Rolex Air King 116900 Very good Steel 40mm Automatic Finland, Imatra
Rolex Air King
5 970 
Verified Dealer
12
FI
Heuer Very good Steel 51mm Manual winding
TOP
Heuer Compteur
475 
Verified Dealer
73
CH
Breitling Transocean Chronograph UB015212/Q594 Unworn Gold/Steel 43mm Automatic
TOP
Breitling Transocean Chronograph 43MM Stahl Roségold - Bronze...
4 888 
Verified Dealer
280
DE
Breitling Galactic 41 A49350 Good Steel 41mm Automatic
TOP
Breitling Galactic 41 Cockpit Panoramadatum
1 860 
Verified Dealer
1060
DE
Rolex Datejust 16233 Very good Gold/Steel 36mm Automatic
TOP
Rolex Datejust Automatic Two-Tone Gold/Steel - 116233
3 650 
Free shipping
Verified Dealer
555
NL
Rolex Day-Date 36 118138 Unworn Yellow gold 36mm Automatic
Rolex Day-Date 36, Grünes Zifferblatt, Krokolederband,...
20 850 
Verified Dealer
122
DE
Omega De Ville Prestige 424.13.40.20.03.001 New Steel 39.5mm Automatic
Omega De Ville Prestige 39.5mm Stainless Steel Blue Dial...
2 297 
Free shipping
Verified Dealer
80
HK
Rolex Datejust 126334 Very good Steel Automatic Finland, Espoo
Rolex Datejust 41 Silver Dial Oyster Bracelet White Gold...
8 500 
Private Seller
 
FI
Jaeger-LeCoultre Geophysic True Second Q8012520 Very good Rose gold 39.6mm Automatic
TOP
Jaeger-LeCoultre Geophysic True Second
10 440 
Verified Dealer
1420
ES
Jaeger-LeCoultre Master Compressor Diving GMT 160.T.05 Very good Titanium 44mm Automatic Finland, Imatra
Jaeger-LeCoultre Master Compressor Diving GMT
6 590 
Verified Dealer
12
FI
TAG Heuer Carrera Calibre 6 WV5111.FC6350 Unworn Steel 39mm Automatic
TAG Heuer CARRERA Calibre 6 Chronometer WV5111.FC6350
2 487 
Verified Dealer
287
DE
Breitling Superocean II 44 A17392 Very good Steel 44mm Automatic
TOP
Breitling Superocean II 44 Automatik Herrenuhr Stahl Ref. A17392
2 160 
Verified Dealer
DE
Tissot Ballade Powermatic 80 COSC T108.408.16.057.00 New Steel Automatic
TOP
Tissot Ballade Powermatic 80 COSC
750 
Verified Dealer
135
ES
Zenith Port Royal 03.0550.4010 Very good Steel 40mm Automatic
TOP
Zenith 40 x 57 Port Royal El Primero Grand Grande Date...
2 900 
Free shipping
Verified Dealer
555
NL
Ulysse Nardin 8152-111-2/91 New Rose gold 40mm Automatic
TOP
Ulysse Nardin Classico 40mm
9 279 
Verified Dealer
2763
DE
Breitling Montbrillant A41330 Very good Steel 38mm Automatic Finland, Espoo
Breitling Montbrillant
3 092 
Private Seller
 
FI
Ulysse Nardin Maxi Marine Diver 263-90 Very good Steel 45mm Automatic
Ulysse Nardin Maxi Marine Diver - AS NEW - SALE
5 161 
Free shipping
Verified Dealer
22
CH
Zenith El Primero Stratos Spindrift 75.2060.4061/21.R573 Very good Steel 45mm Automatic Finland, Imatra
Zenith El Primero Stratos Spindrift
4 950 
Verified Dealer
12
FI
Omega Seamaster Aqua Terra 231.20.42.22.06.001 Very good Gold/Steel 41.5mm Automatic
TOP
Omega Seamaster Aqua Terra Day/Date with Box
4 867 
Free shipping
Verified Dealer
TR
Rolex Submariner Date 16610 T Very good Steel 40mm Automatic
TOP
Rolex Submariner Date RRR No holes 16610 T Full Set 2008
9 950 
Verified Dealer
 
FR
Eberhard & Co. Champion V EV31063.5CP New Steel 42,80mm Automatic
TOP
Eberhard & Co. Champion Acero
1 800 
Verified Dealer
135
ES
Breitling Cockpit Lady A71365 Very good Steel 31mm Quartz
TOP
Breitling Cockpit Pilot Lady's Watch Blue Dial Date 31mm - A71365
1 100 
Free shipping
Verified Dealer
555
NL
Omega De Ville Prestige 424.58.40.20.52.001 New Yellow gold 39.5mm Automatic
TOP
Omega 424.58.40.20.52.001 DE VILLE
12 785 
Verified Dealer
19
HK
Mido Baroncelli M027.408.11.051.00 New Steel 40mm Automatic
TOP
Mido Baroncelli Chronometer Silizium
929 
Verified Dealer
2763
DE
Omega Seamaster Planet Ocean 232.30.46.21.01.001 Very good Steel 45mm Automatic Finland, kauhava
Omega Seamaster Planet Ocean
3 399 
Private Seller
 
FI
Rolex GMT-Master II 16713 Very good Gold/Steel 40mm Automatic
Rolex GMT-Master II
9 045 
Verified Dealer
 
US
Panerai Luminor 1950 3 Days GMT Automatic PAM 00441 Unworn Ceramic 44mm Automatic Finland, Imatra
Panerai Luminor 1950 3 Days GMT Automatic
7 890 
Verified Dealer
12
FI
Omega 2503-15 Very good Steel 36mm Manual winding Finland, Helsinki
Omega Vintage cal 266 year 1952
490 
Private Seller
 
FI
Michael Kors MK8362 Unworn Steel 45mm Quartz
Michael Kors Chronograph MK8362
145 
Private Seller
 
DE
Chopard Mille Miglia 168997-3001 Very good Steel 44mm Automatic
TOP
Chopard Mille Miglia GT XL
2 571 
Verified Dealer
67
PL
Montblanc Heritage Chronométrie 113779 Very good Steel 41mm Automatic
TOP
Montblanc Vasco da Gama Heritage Chronométrie GMT Dual-Time...
2 550 
Free shipping
Verified Dealer
555
NL
Omega Constellation Day-Date 123.25.38.22.02.001 New Gold/Steel 38mm Automatic
TOP
Omega 123.25.38.22.02.001 CONSTELLATION
10 345 
Verified Dealer
19
HK
Chopard Grand Prix de Monaco Historique 168570-3001 New Titanium 45mm Automatic
TOP
Chopard Grand Prix De Monaco Historique Chronograph
4 849 
Verified Dealer
2763
DE
Omega De Ville Hour Vision 431.63.41.22.13.001 Very good Rose gold 41mm Automatic Finland, Helsinki
Omega De Ville Hour Vision Annual Calendar Red Gold
14 900 
Verified Dealer
18
FI
Rolex Milgauss 116400GV Unworn Steel 40,00mm Automatic
Rolex Milgauss
8 890 
Free shipping
Verified Dealer
5
DE
Breitling Superocean Héritage 46 A17320 Very good Steel 46mm Automatic Finland, Imatra
Breitling Superocean Heritage 46 SERVICED
2 950 
Verified Dealer
12
FI
Rolex Yacht-Master II 116680 Very good Steel 44mm Automatic
Rolex Yacht-Master II 116680 44mm MINT, COMPLETE SET
13 521 
Verified Dealer
10
US
Omega Speedmaster Professional Moonwatch 311.92.44.51.01.005 Very good Ceramic Automatic
Omega Speedmaster Professional Moonwatch
7 254 
Verified Dealer
19
US
Omega Constellation 168.0056 Good Steel 35mm Automatic Finland, Helsinki
Omega Constellation C Date
950 
Verified Dealer
16
FI
Chopard L.U.C 168912 Very good Steel 42.5mm Automatic
TOP
Chopard L.U.C Pro One Diver black dial 42,5mm - 168912
2 800 
Free shipping
Verified Dealer
NL
Omega Constellation Men 123.10.38.21.06.001 New Steel 38mm Automatic
TOP
Omega 123.10.38.21.06.001 CONSTELLATION
3 627 
Verified Dealer
19
HK
Mido Baroncelli M027.408.16.031.00 New Steel 40mm Automatic
TOP
Mido Baroncelli Chronometer Silizium
909 
Verified Dealer
2763
DE
Rolex Oyster Perpetual Date 11/1736 Very good Steel 35mm Automatic
Rolex Oyster Perpetual Date ‘underline Dial’
4 734 
Verified Dealer
UK
Rolex Sea-Dweller Deepsea 116660 Unworn Steel 44,00mm Automatic
Rolex Sea-Dweller Deepsea
13 770 
Free shipping
Verified Dealer
5
DE
Rolex Explorer II 16570 Very good Steel 40mm Automatic Finland, Imatra
Rolex Explorer II
6 290 
Verified Dealer
12
FI
Rolex Lady-Datejust 179160 Good Steel 26mm Automatic
Rolex Lady Datejust 26 Stainless Steel 179160 {With Bracelet}
3 558 
Verified Dealer
10
US
Breitling Chronomat 44 HB0110 Fair Rose gold 44mm Automatic
Breitling Chronomat 44
22 000 
Verified Dealer
5
NL
Rolex Datejust 16233 Very good Gold/Steel 36mm Automatic
Rolex Datejust 36 Steel/Gold Jubilee Fluted Tapestry Dial
5 250 
Verified Dealer
1310
NL
Paul Picot C-Type 0851T Very good Titanium 43mm Automatic
TOP
Paul Picot C-TYPE COMPASS Chronograph Limited 300 Pieces 43mm
2 100 
Free shipping
Verified Dealer
555
NL
Omega Constellation Day-Date 123.25.38.22.02.002 New Gold/Steel 38mm Automatic
TOP
Omega 123.25.38.22.02.002 CONSTELLATION
10 345 
Verified Dealer
19
HK
Mido Baroncelli M027.208.11.011.00 New Steel 34mm Automatic
TOP
Mido Baroncelli Chronometer
929 
Verified Dealer
2763
DE
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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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