Over 400,000 watches covered by Chrono24 Buyer Protection

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Rolex Day-Date 40 228345 RBR New Rose gold 40mm Automatic
TOP
Rolex Day-Date 40 Choco Diamonds Baguette (2021)
R1 157 149
Professional dealer
1118
DE
Rolex Datejust 16019 Very good White gold 36mm Automatic
TOP
Rolex Datejust 16019 rare 18K Gold Weissgold White Herrenuhr...
R1 053 375
Professional dealer
723
DE
Ulysse Nardin Marine Chronometer Manufacture 1183-126-3/42 New Steel 43mm Automatic
TOP
Ulysse Nardin Marine Chronometer Manufacture
R119 402
Professional dealer
10
ES
Omega Speedmaster Professional Moonwatch Moonphase 30493445203001 New Ceramic 44.2mm Automatic
TOP
Omega Speedmaster Moonphase Co-Axial Master Chronometer Blue...
R165 934
Professional dealer
1417
NL
Omega Seamaster Diver 300 M 2531.80 Very good Steel 41mm Automatic South Africa, Pretoria
Omega Seamaster Diver 300 M
R21 500
Private Seller
ZA
TAG Heuer Aquaracer 300M CAF101E.FT8011 Very good 5mm Manual winding South Africa, Johannesburg
TAG Heuer Aquaracer 300M
R13 500
Private Seller
ZA
Omega Constellation 168.005 Fair Gold/Steel 34.0mm Automatic
TOP
Omega Constellation Cal. 564
R24 726
Professional dealer
22
US
Omega Speedmaster Professional Moonwatch 310.20.42.50.01.001 Unworn Gold/Steel 42mm Manual winding
Omega Speedmaster Moonwatch Apollo 11 Co-Axial Stahl / Gold ...
R262 510
Sold by Chrono24
DE
Omega Constellation Ladies 123.20.35.20.58.001 New Gold/Steel 35mm Automatic
TOP
Omega Constellation 123.20.35.20.58.001 CO‑AXIAL 35 MM
R90 456
Professional dealer
894
US
Omega Constellation 168.0058 Very good Steel 36mmmm Automatic South Africa, Cape Town
Omega Constellation Tv Dial Gents Watch-1970s
R11 000
Private Seller
ZA
Breitling Navitimer 01 AB012012/BB01/447A Very good Steel 43mm Automatic South Africa, Johannesburg
Breitling Navitimer 01 AB012012 on Bracelet, Box & Papers,...
R98 239
Free shipping
Professional dealer
27
ZA
Cartier Santos 100 W20073X8 Very good Steel 41mm Automatic
TOP
Cartier Santos 100 Stainless Steel Iced Out Watch W20073X8
R181 350
Professional dealer
850
US
Ebel 1911 BTR E9240L70 Good Steel 44.5mm Automatic South Africa, 2195
Ebel 1911 BTR GMT
R25 000
Private Seller
ZA
Omega Constellation 167.021 Very good Steel 33mm Automatic
TOP
Omega Constellation Chronometer 1966
R27 199
Professional dealer
168
HU
Omega Constellation Day-Date 168.029 Good Gold/Steel 35mm Automatic
TOP
Omega Constellation Cal. 751 18K Gold Capped Vintage 1970
R36 273
Professional dealer
22
US
Rolex Datejust 126334 Very good Gold/Steel 41mm Automatic
Rolex Datejust 41 Stahl / Weissgold Diamanten Oyster Perpetual...
R218 612
Sold by Chrono24
DE
Rolex Submariner (No Date) 124060 Very good Steel 41mm Automatic South Africa, Centurion
Rolex Submariner
R235 000
Professional dealer
31
ZA
Omega Seamaster Aqua Terra 231.53.43.22.02.002 Very good Rose gold 43mm Automatic South Africa, Johannesburg
Omega Seamaster Aqua Terra Co-Axial Annual Calendar 18K Rose Gold
R149 999
Free shipping
Professional dealer
206
ZA
Breitling Hercules A39362 Very good Steel 45mm Automatic
TOP
Breitling Hercules
R45 566
Professional dealer
2222
ES
Breitling Avenger II Seawolf A1733110 Very good Steel 45mm Automatic South Africa, Johannesburg
Breitling Avenger Ii Seawolf 45mm, A1733110, Mint Condition
R34 762
Free shipping
Professional dealer
27
ZA
Cartier Santos 100 W20090X8 Very good Steel 41mm Automatic
TOP
Cartier Santos 100 Chronograph Stainless Steel Iced Out Watch...
R241 805
Professional dealer
850
US
Omega Constellation Men 12320382103001 Good 38mm Automatic South Africa, Table View
Omega Constellation Co-Axial 38 mm
R65 000
Private Seller
ZA
Ulysse Nardin A.261 Good Steel 34mm Automatic
TOP
Ulysse Nardin Vintage Chronometer 36000
R39 115
Professional dealer
39
CH
Breitling Chrono-Matic 1461 A19360 Very good Steel 49mm Automatic South Africa, Johannesburg
Breitling Chrono-Matic 1461
R50 000
Private Seller
ZA
Omega De Ville Co-Axial 4631.30.00 Very good Yellow gold 37.5mm Automatic
Omega De Ville Co-Axial Chronometer 18K Gold Automatik...
R85 162
Sold by Chrono24
DE
Rolex Submariner Date 16610 T Very good Steel 40mm Automatic South Africa, Centurion
Rolex Submariner Date
R163 500
Professional dealer
31
ZA
Omega De Ville Prestige 424.23.40.21.13.001 Very good Gold/Steel Automatic South Africa, Johannesburg
Omega DE-VILLE CO-AXIAL
R44 999
Free shipping
Professional dealer
206
ZA
Omega De Ville Prestige 4300.31.00 Good Gold/Steel 34.7mm Automatic South Africa, Centurion
Omega De Ville Prestige
R25 000
Private Seller
ZA
TAG Heuer Kirium WL5113 Good Steel 38mm Quartz South Africa, Waterfall
TAG Heuer Kirium
R12 000
Private Seller
ZA
Rolex Submariner (No Date) 124060 Unworn Steel 41mm Automatic South Africa, Johannesburg
Rolex Submariner Ref.124060, 41mm, Unworn, Box & Papers 2021
R232 752
Free shipping
Professional dealer
27
ZA
Breitling Avenger Seawolf A73390 Very good Steel 45mm Quartz South Africa, Cape Town
Breitling Avenger Seawolf
R40 000
Private Seller
ZA
Ulysse Nardin Marine Chronometer 41mm 263-66 Very good Steel 41mm Automatic
TOP
Ulysse Nardin Marine Chronometer 41 mm
R56 372
Professional dealer
39
CH
Breitling Superocean Chronograph II A13340 Very good Steel 42mm Automatic South Africa, Knysna
Breitling Superocean Chronograph
R34 762
Private Seller
ZA

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.