Buyer Protection Authenticity Guarantee Why Chrono24? South Africa  | ZAR
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Rolex Yacht-Master 16622 40mm Steel Platinum Pre-Owned 2012
TOP
Rolex Yacht-Master 16622 40mm Steel Platinum Pre-Owned 2012
R 98,781
Seller
Click2Shop Limited
29
UK
Omega Vintage Seamaster Chronometer for Meister / 36 mm / 1971
Omega Vintage Seamaster Chronometer for Meister / 36 mm / 1971
R 24,468
Free shipping
Seller
VintageCaliber GmbH
32
DE
Omega Seamaster 200 - Pre Bond - Automatik Luxus Chronometer...
Omega Seamaster 200 - Pre Bond - Automatik Luxus Chronometer...
R 22,005
Free shipping
Seller
Antique Watches GmbH
41
DE
Rolex Day-Date 18 Carat Yellow Gold 18238 With Box and Paper
Rolex Day-Date 18 Carat Yellow Gold 18238 With Box and Paper
R 200,492
Seller
Beau Gems Ltd
 
UK
Rolex EXPLORER II so called "Albino"
Rolex EXPLORER II so called "Albino"
R 349,080
Seller
Uhren Schöfer GmbH
DE
Rolex Datejust Stainless Steel 69174
Rolex Datejust Stainless Steel 69174
R 57,676
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
66
UK
Hublot 301.AI.460.RX
TOP
Hublot 301.AI.460.RX
R 158,479
Seller
Deluxe ( Asia ) Ltd
9
HK
Rolex Datejust
Rolex Datejust
R 128,850
Seller
Juwelier Rubin GbR
 
DE
Rolex 16610LV 16610 LV "FLAT 4" Submariner 50th...
Rolex 16610LV 16610 LV "FLAT 4" Submariner 50th...
R 248,712
Seller
European Watch Company
56
US
Rolex Sea Dweller Stahl 16600 Automatik
Rolex Sea Dweller Stahl 16600 Automatik
R 91,185
Seller
Juwelier Rieger
99
DE
IWC Rare Marriage "Portuguese" Cal.74 / MoP / 1921 /...
IWC Rare Marriage "Portuguese" Cal.74 / MoP / 1921 /...
R 44,043
Free shipping
Seller
VintageCaliber GmbH
32
DE
Omega »CONSTELLATION AUTOMATIC« CHRONOMETER VON 1970
Omega »CONSTELLATION AUTOMATIC« CHRONOMETER VON 1970
R 12,218
Free shipping
Seller
Antique Watches GmbH
41
DE
Rolex Explorer II Ref 216570 From 2012 With Box and Papers
Rolex Explorer II Ref 216570 From 2012 With Box and Papers
R 96,126
Seller
Beau Gems Ltd
 
UK
Rolex GMT-MASTER II  Tritium
Rolex GMT-MASTER II Tritium
R 218,583
Seller
Uhren Schöfer GmbH
DE
Rolex Rare S/S O/P UAE Air Force Pepsi Bezel GMT-Master...
Rolex Rare S/S O/P UAE Air Force Pepsi Bezel GMT-Master...
R 1,739,427
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
66
UK
Bulgari DG42BSCVDCH
TOP
Bulgari DG42BSCVDCH
R 79,240
Seller
Deluxe ( Asia ) Ltd
9
HK
Omega Seamaster Professional 300m Automatic - 41 mm
Omega Seamaster Professional 300m Automatic - 41 mm
R 25,936
Seller
wagener-gold International e.K.
702
DE
Rolex Date zaffiro art. Rd358nl
Rolex Date zaffiro art. Rd358nl
R 45,674
Seller
Stroppiana SRL
218
IT
Rolex Yacht Master 116622 Stahl Platin 40 mm Yacht-Master
Rolex Yacht Master 116622 Stahl Platin 40 mm Yacht-Master
R 122,178
Seller
Juwelier Rieger
99
DE
Omega Vintage Constellation / Pie-Pan Dial / Steel / 1967
Omega Vintage Constellation / Pie-Pan Dial / Steel / 1967
R 42,412
Free shipping
Seller
VintageCaliber GmbH
32
DE
Omega 750/18kt Gelbgold exklusive Chronometer Herrenuhr v 1944...
Omega 750/18kt Gelbgold exklusive Chronometer Herrenuhr v 1944...
R 54,483
Free shipping
Seller
Antique Watches GmbH
41
DE
Longines Grande Vitesse
Longines Grande Vitesse
R 22,021
Seller
Joaillerie Royale
240
BE
Rolex Oyster Datejust Bark Yellow Gold Diamonds 26 mm (Full Set)
Rolex Oyster Datejust Bark Yellow Gold Diamonds 26 mm (Full Set)
R 138,653
Seller
Kleen Edelmetalen
109
NL
Omega Seamaster 300 Spectre 007 James Bond Limited Edition
Omega Seamaster 300 Spectre 007 James Bond Limited Edition
R 119,013
Seller
Swiss Horology
 
UK
Montblanc 102345
TOP
Montblanc 102345
R 131,725
Seller
Deluxe ( Asia ) Ltd
9
HK
Rolex Sea-Dweller
Rolex Sea-Dweller
R 89,717
Seller
Juwelier Burger, since 2001
417
NL
Rolex Sea-Dweller - Triple Six - Full Set
Rolex Sea-Dweller - Triple Six - Full Set
R 143,547
Seller
PASSIONE VINTAGE
67
IT
Rolex Explorer II SEL Scat/Gar art. Re782
Rolex Explorer II SEL Scat/Gar art. Re782
R 73,405
Seller
Stroppiana SRL
218
IT
Rolex Sea-Dweller DeepSea D-Blue ref. 116660
Rolex Sea-Dweller DeepSea D-Blue ref. 116660
R 174,540
Seller
Eorologi
207
IT
Omega Constellation Automatik Chronometer von 1961 - Pie Pan -...
Omega Constellation Automatik Chronometer von 1961 - Pie Pan -...
R 28,530
Free shipping
Seller
Antique Watches GmbH
41
DE
Breitling BENTLEY SPECIAL EDITION
Breitling BENTLEY SPECIAL EDITION
R 68,348
Seller
Joaillerie Royale
240
BE
Baume & Mercier Classima XL Chronograph Executives
TOP
Baume & Mercier Classima XL Chronograph Executives
R 21,043
Seller
Private seller
 
DE
Rolex Oyster Datejust II Jubilee Steel Blue Dial 41 mm (Full Set)
Rolex Oyster Datejust II Jubilee Steel Blue Dial 41 mm (Full Set)
R 99,504
Seller
Kleen Edelmetalen
109
NL
Corum 895-931-06-0371-AN92
TOP
Corum 895-931-06-0371-AN92
R 97,937
Seller
Deluxe ( Asia ) Ltd
9
HK
Omega Seamaster Professional Chronograph 300 m - Automatic -...
Omega Seamaster Professional Chronograph 300 m - Automatic -...
R 30,830
Seller
wagener-gold International e.K.
702
DE
Rolex Daytona -  Full Set
Rolex Daytona - Full Set
R 226,739
Seller
PASSIONE VINTAGE
67
IT
Rolex submariner art. Rb639
Rolex submariner art. Rb639
R 80,745
Seller
Stroppiana SRL
218
IT
Rolex S/S Rare Mark I Dial Flat 4 Green Bezel Submariner 16610LV
Rolex S/S Rare Mark I Dial Flat 4 Green Bezel Submariner 16610LV
R 173,943
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
66
UK
Omega Seamaster Automatik Chronometer Herrenuhr 1970 - Ref....
Omega Seamaster Automatik Chronometer Herrenuhr 1970 - Ref....
R 21,190
Free shipping
Seller
Antique Watches GmbH
41
DE
Omega Seamaster 300M Midsize
Omega Seamaster 300M Midsize
R 27,323
Seller
Juwelier Burger, since 2001
417
NL
Rolex Seadweller 126600 43MM Ceramic New Model Not in Stores Rare
Rolex Seadweller 126600 43MM Ceramic New Model Not in Stores Rare
R 236,137
Seller
The Watch Collector NY
 
US
Rolex Oyster Perpetual 39 mm
Rolex Oyster Perpetual 39 mm
R 66,864
Seller
Uhrencenter Berlin
193
DE
Rolex Daydate Weissgold 750 Diamanten 18239 Automatik  DayDate
Rolex Daydate Weissgold 750 Diamanten 18239 Automatik DayDate
R 195,583
Seller
Juwelier Rieger
99
DE
Rolex 116520 Dayt. Stahl Neu B & P mit orig. 116506 Platin...
Rolex 116520 Dayt. Stahl Neu B & P mit orig. 116506 Platin...
R 406,989
Seller
C & F Handelskontor GmbH
 
DE
Rolex DATEJUST EDELSTAHL / 18K GOLD GELBGOLD SERVICE 09/2016
Rolex DATEJUST EDELSTAHL / 18K GOLD GELBGOLD SERVICE 09/2016
R 65,086
Free shipping
Seller
Timeless Watches GmbH
92
DE
Rolex Explorer I scat/gar art. Re345
Rolex Explorer I scat/gar art. Re345
R 60,355
Seller
Stroppiana SRL
218
IT
Rolex S/S White Dial Zenith Movement Cosmograph Daytona 16520
Rolex S/S White Dial Zenith Movement Cosmograph Daytona 16520
R 237,111
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
66
UK
Omega Seamaster Diver 300 M
Omega Seamaster Diver 300 M
R 40,944
Seller
Prestige Luxusuhren GmbH
2351
DE
Rolex Daytona
Rolex Daytona
R 164,753
Seller
Juwelier Burger, since 2001
417
NL
Rolex Oyster Perpetual Submariner 16610 Black PVD
Rolex Oyster Perpetual Submariner 16610 Black PVD
R 118,090
Seller
Phigora
63
US
Breitling : Navitimer :  A23322 :  Stainless Steel
Breitling : Navitimer : A23322 : Stainless Steel
R 60,094
Seller
BernardWatch.com
129
US
Breitling Colt Chronometer Automatic - A17380
Breitling Colt Chronometer Automatic - A17380
R 25,936
Seller
wagener-gold International e.K.
702
DE
Omega Aqua Terra 150M Co-Axial Master Chronometer 41mm G
Omega Aqua Terra 150M Co-Axial Master Chronometer 41mm G
R 63,275
Seller
Plus Watch - Luxury Watches
2140
IT
Rolex ROLEX DAYTONA  16518 ZENITH ‘LUCKY EIGHT’
Rolex ROLEX DAYTONA 16518 ZENITH ‘LUCKY EIGHT’
R 221,845
Seller
SENZATEMPO
40
IT
Rolex Seadweller art. Rb628
Rolex Seadweller art. Rb628
R 87,270
Seller
Stroppiana SRL
218
IT
Rolex Sea Dweller Deepsea D-Blue Stahl 116660
Rolex Sea Dweller Deepsea D-Blue Stahl 116660
R 187,427
Seller
Juwelier Rieger
99
DE
Rolex 116710LN   GMT Master II Black Index Dial
Rolex 116710LN GMT Master II Black Index Dial
R 113,607
Seller
K&S Watch & Jewellery
12
HK
Omega Seamaster Professional Diver 300M
Omega Seamaster Professional Diver 300M
R 26,752
Seller
Juwelier Burger, since 2001
417
NL
Rolex Oyster Perpetual Day-Date 18K YG 18038
Rolex Oyster Perpetual Day-Date 18K YG 18038
R 166,720
Seller
Phigora
63
US
Rolex Datejust II 126334
Rolex Datejust II 126334
R 145,178
Seller
Mall of the Watch
373
MC

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.