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TOP
Omega 123.10.38.22.01.001 CONSTELLATION
Price on request
Verified Dealer
10
HK
TOP
IWC Da Vinci Perpetual Calendar Chronograph Rattrapante 3754-003
R 231 010
Free shipping
Verified Dealer
181
US
TOP
Ulysse Nardin Marine Chronometer Manufacture
R 74 309
Verified Dealer
AE
TOP
Breitling Crosswind Racing 18K/SS Special Mother of Pearl Dial
R 71 200
Free shipping
Verified Dealer
181
US
TOP
Rolex Datejust Pearlmaster 39, official price 112.000 CHF
R 1 115 939
Verified Dealer
28
CH
TOP
Rolex Pearlmaster White Gold MOP Diamond Dial Luxus 34mm
R 284 344
Verified Dealer
511
DE
Bremont Supermarine S2000 / BK
R 75 750
Private Seller
ZA
Jaeger-LeCoultre Geophysic Mens Watch
R 139 900
Verified Dealer
ZA
TOP
Chopard L.U.C Pro One Diver black dial 42,5 - TOP CONDITION
R 54 363
Free shipping
Verified Dealer
451
NL
Breitling Superocean II 42
R 52 021
Verified Dealer
26
ES
TOP
Chopard Manufacture Caliber Mille Miglia 01.01-C GT XL 8565
R 50 098
Verified Dealer
371
ES
TOP
Hublot Big Bang Carbon Bezel Baguette 23650€ HT
R 449 958
Free shipping
Verified Dealer
132
FR
Omega Seamaster Planet Ocean Chronograph
R 59 999
Verified Dealer
ZA
TOP
Hublot Classic Fusion Ultra-Thin 42, official price 11.900 CHF
R 122 281
Verified Dealer
28
CH
Omega Seamaster Planet Ocean
R 47 000
Verified Dealer
ZA
Omega Constellation Chronometer Pie Pan shark gold 2852
R 37 636
Private Seller
 
NL
TAG Heuer Grand Carrera
R 39 900
Verified Dealer
ZA
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
R 40 981
Verified Dealer
62
DE
Rolex Rare Date Automatic Steel 1530
R 142 189
Free shipping
Verified Dealer
417
UK
Rolex Sea-Dweller
R 128 903
Verified Dealer
 
US
TOP
Breitling NAVITIMER 01 ROSEGOLD RB012012 unworn 12230HT
R 232 506
Free shipping
Verified Dealer
132
FR
Omega Constellation Ladies
R 98 999
Verified Dealer
ZA
TOP
Hublot Classic Fusion Ultra-Thin 42, official price 27.300 CHF
R 275 151
Verified Dealer
28
CH
Rolex Daytona Platinum Diamond 40mm Watch 116576TBR
R 2 426 398
Free shipping
Verified Dealer
191
US
Omega Speedmaster Moonwatch Apollo 11 50th Anniversary NEW
R 212 296
Verified Dealer
149
US
Omega Speedmaster 57 Co-Axial Stainless Steel Brown strap
R 98 523
Verified Dealer
749
BE
Breitling Transocean Chronograph Mens 43mm Watch
R 85 313
Verified Dealer
71
UK
Rolex Submariner Kermit 16610LV
R 567 807
Free shipping
Verified Dealer
417
UK
F.P.Journe Chronometre Bleu Chronometre Bleu Tantalum Blue...
R 568 690
Verified Dealer
346
US
TOP
Breitling CHRONOMAT 44 GMT AUTOMATIC AB042011 unworn 4750ht
R 90 159
Free shipping
Verified Dealer
132
FR
Rolex Lady-Datejust Flower Dial
R 88 999
Verified Dealer
ZA
TOP
Breguet Secret de la Reine, new, official price 90.000 CHF
R 840 772
Verified Dealer
28
CH
Rolex Datejust 41 Steel & White Gold Blue Diamond Jubilee ...
R 181 966
Free shipping
Verified Dealer
191
US
Rolex Datejust 41 126334
R 151 651
Verified Dealer
149
US
Rolex Air King
R 75 067
Verified Dealer
 
US
Rolex Day-Date 40mm Rose Gold President White Roman Dial
R 447 370
Free shipping
Verified Dealer
12
US
Rolex GMT-Master Vintage UAE Air Force 1675
R 1 801 057
Free shipping
Verified Dealer
417
UK
Rolex Datejust--126334--09-2019--LC-EU--DARK-RHODIUM--NEW--UNW...
R 158 907
Verified Dealer
28
NL
Omega Seamaster Diver 300 M
R 45 216
Verified Dealer
10
UK
TAG Heuer Grand Carrera
R 108 999
Verified Dealer
ZA
TOP
Rolex Lady-Datejust 26, official price 24.200 CHF
R 252 221
Verified Dealer
28
CH
Rolex Datejust 41mm Stainless Steel Blue Diamond Dial Watch...
R 159 218
Free shipping
Verified Dealer
191
US
Rolex Datejust 41mm Basel Release Blue Roman 2019
R 149 831
Verified Dealer
149
US
Rolex Datejust Oyster Perpetual 36mm Automatic Watch
R 72 763
Free shipping
Verified Dealer
169
RO
Rolex 16610LV Submariner Date 'The First' - Rare Y Serial Fat...
R 521 359
Free shipping
Verified Dealer
107
UK
Rolex GMT-Master Pepsi 16700
R 199 064
Free shipping
Verified Dealer
417
UK
Omega Seamaster Planet Ocean 44 mm Blue (It´s New)
R 77 781
Verified Dealer
92
ES
Omega Seamaster Diver 300 M
R 47 301
Verified Dealer
10
UK
Breitling Starliner
R 119 000
Verified Dealer
ZA
TOP
Rolex Datejust Pearlmaster 34
R 305 726
Verified Dealer
28
CH
Rolex Datejust 41 Steel & White Gold Black Diamond Jubilee 126334
R 166 801
Free shipping
Verified Dealer
191
US
Rolex Datejust 41mm 2019 NEW 126334
R 148 618
Verified Dealer
149
US
Tudor 41mm Heritage Black Bay Chronograph Watch 79350
R 53 078
Verified Dealer
9
US
Breitling Colt Ocean Chrono Blue Dial
R 25 091
Verified Dealer
1176
NL
Rolex Daytona APH 116520
R 407 608
Free shipping
Verified Dealer
417
UK
Rolex 16520 Daytona Zenith Movement White Dial SS (31994)
R 362 445
Verified Dealer
346
US
Omega Seamaster Diver 300 M
R 39 339
Verified Dealer
10
UK
Omega DE-VILLE CO-AXIAL
R 69 999
Verified Dealer
ZA
TOP
Rolex Lady-Datejust 26, official price 16.700 CHF
R 175 786
Verified Dealer
28
CH
Omega Seamaster Planet Ocean 600M Chronograph
R 91 163
Verified Dealer
10
EE
Omega Seamaster Planet Ocean 44 mm Black (It´s NEW)
R 77 781
Verified Dealer
92
ES
Omega Seamaster Planet Ocean
R 65 210
Free shipping
Verified Dealer
118
US
Breitling Bentley Motors
R 70 254
Verified Dealer
1176
NL
Rolex Hulk Submariner 116610LV
R 236 981
Free shipping
Verified Dealer
417
UK
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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.