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Breitling Superocean 44 A17367021I1S2 New Steel 44mm Automatic
TOP
Breitling Superocean Automatic 44
R 53 621
Professional dealer
13
AE
Hublot Classic Fusion Ultra-Thin 545.NX.1270.LR New Titanium 42mm Manual winding
TOP
Hublot Classic Fusion ultra-thin, new, 42mm, titanium, manual...
R 110 240
Professional dealer
58
CH
Omega Seamaster Planet Ocean 2201.50.00 Good Steel Automatic South Africa, East London
Omega Seamaster Planet Ocean Ref 2201.50.00
R 33 999
Private Seller
ZA
Omega Speedmaster Professional Moonwatch 311.92.44.51.01.003 Very good Ceramic 44mm Automatic
Omega Speedmaster Dark Side of the Moon Automatik 311.92.44.51...
R 134 149

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
R 92 533
Professional dealer
850
US
Breitling Bentley 6.75 A44362 Very good Steel 48mm Automatic South Africa, Centurion
Breitling Bentley 6.75
R 61 750
Professional dealer
26
ZA
Breitling Navitimer World A2432212/B726 Very good Steel 46mm Automatic South Africa, Johannesburg
Breitling Navitimer World Ref.A24322, Box & Papers, 2019,...
R 57 969
Free shipping
Professional dealer
13
ZA
Breitling for Bentley Unworn Steel 49mm Automatic
TOP
Breitling Bentley 05 Unitime Steel White Dial Mens Watch...
R 181 138
Professional dealer
213
US
Rolex Submariner Date 16613T Good Gold/Steel 40mm Automatic South Africa, Johannesburg
Rolex Submariner Date Gold&Steel 40mm 2007
R 130 651
Free shipping
Professional dealer
ZA
Omega Seamaster Diver 300 M 2531.80 Very good Steel 41mm Automatic South Africa, Pretoria
Omega Seamaster Diver 300 M
R 21 500
Private Seller
ZA
Omega De Ville Ladymatic 425.30.34.20.55.001 Very good Yellow gold Automatic South Africa, East London
Omega De Ville Ladymatic Solid 18ct Gold
R 49 999
Private Seller
ZA
Breitling Superocean Chronograph II A13340 Very good Steel 42mm Automatic South Africa, Knysna
Breitling Superocean Chronograph
R 36 231
Private Seller
ZA
TAG Heuer Kirium WL5113 Good Steel 38mm Quartz South Africa, Waterfall
TAG Heuer Kirium
R 12 000
Private Seller
ZA
Omega Constellation Men 123.20.38.21.03.001 Good Steel 38mm Automatic South Africa, Table View
Omega Constellation Men
R 73 000
Private Seller
ZA
Hublot Classic Fusion Ultra-Thin 515.NX.1270.LR New Titanium 45mm Manual winding
TOP
Hublot Classic Fusion ultra-thin, new, 45mm, titanium, manual...
R 110 240
Professional dealer
58
CH
Breitling Chronomat 44 HB0110 Unworn Yellow gold 44mm Automatic
Breitling Chronomat 44 18K Gold Automatik Herrenuhr Ref....
R 247 780

Sold by Chrono24

DE
Ulysse Nardin 266-66-3/62 Very good Rose gold 41mm Automatic South Africa, Johannesburg
Ulysse Nardin Maxi Marine Chronograph Automatic 41mm
R 111 590
Free shipping
Professional dealer
13
ZA
Breitling Chronomat GMT MB04108P/BD76 Very good Steel 47mmmm Automatic South Africa, Centurion
Breitling Chronomat GMT
R 136 000
Professional dealer
26
ZA
Ulysse Nardin A.261 Good Steel 34mm Automatic
TOP
Ulysse Nardin Vintage Chronometer 36000
R 38 612
Professional dealer
29
CH
Heuer 16.8433 Good Steel 56mm Manual winding South Africa, Malelane
Heuer Rallye leonidas sa swiss 16.8433
R 28 000
Private Seller
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
R 179 999
Free shipping
Professional dealer
149
ZA
Zenith CP.-2 Steel Chronograph
TOP
Zenith A. Cairelli Tipo CP-2 Mai Lucidato
R 193 120
Professional dealer
150
IT
Omega Seamaster Aqua Terra 220.10.41.21.02.001 Very good Steel 41mm Automatic South Africa, PRETORIA
Omega Seamaster Aqua Terra Co-axial Master
R 60 000
Free shipping
Professional dealer
 
ZA
Breitling NB0434E5/BE94 New Carbon 45mm Automatic
TOP
Breitling for Bentley GMT, new, chronograph, carbon case and...
R 193 216
Professional dealer
58
CH
Ulysse Nardin Marine 263-55 Very good Steel 40.5mm Automatic
Ulysse Nardin Marine Chronometer Automatik Stahl Herrenuhr...
R 43 969

Sold by Chrono24

DE
Omega Constellation 2852 Good Yellow gold 35mm Automatic South Africa, Johannesburg
Omega Constellation Piepan Circa 1959 35mm, Ref.2852
R 66 664
Free shipping
Professional dealer
13
ZA
Breitling Bentley Flying B a44365 Very good Steel 44MMmm Automatic South Africa, Centurion
Breitling Bentley Flying B Chronograph
R 77 900
Professional dealer
26
ZA
Ulysse Nardin Marine Chronometer 41mm 263-66 Very good Steel 41mm Automatic
TOP
Ulysse Nardin Marine Chronometer 41 mm
R 54 372
Professional dealer
29
CH
Rolex Sea-Dweller Deepsea 116660 Good Steel 44mm Automatic South Africa, Cape Town
Rolex Sea-Dweller Deepsea
R 169 000
Professional dealer
6
ZA
Omega De Ville Prestige 424.23.40.21.13.001 Very good Gold/Steel Automatic South Africa, Johannesburg
Omega DE-VILLE CO-AXIAL
R 52 999
Free shipping
Professional dealer
149
ZA
Omega Speedmaster Professional Moonwatch 311.63.44.51.99.001 Very good Ceramic 44.25mm Automatic South Africa, Pretoria
Omega Speedmaster Moonwatch Meteorite
R 154 900
Professional dealer
21
ZA
Ball DG3030B-S3CJ-BK New Titanium 40mm Automatic
TOP
Ball Roadmaster Marine GMT Ceramic Brown
R 38 136
Free shipping
Professional dealer
142
JP
Breguet Reine de Naples 8967ST/V8/J50 New Steel 43mm Automatic
TOP
Breguet Reine de Naples, new, blue mother-of-pearl dial, blue...
R 196 998
Professional dealer
58
CH
Omega Speedmaster Professional Moonwatch 311.92.44.51.01.006 Unworn Ceramic 44mm Automatic
Omega Speedmaster Dark Side of the Moon Automatik 311.92.44.51...
R 167 773

Sold by Chrono24

DE
Rolex Datejust 126334 Very good Steel 41mm Automatic South Africa, Johannesburg
Rolex Datejust 41mm Ref.126334 Immaculate, Black Dial 2018
R 157 965
Free shipping
Professional dealer
13
ZA
Omega Seamaster Aqua Terra 220.10.43.22.03.001 Very good Steel 43mm Automatic South Africa, Centurion
Omega Seamaster Aqua Terra
R 175 000
Professional dealer
26
ZA
Rolex Datejust 126334 Unworn Steel 41mm Automatic
Rolex 126334 Datejust 41 Wimbledon Dial 2020 Stainless Steel
R 217 311
Professional dealer
272
US
Omega Constellation 168.004 Good Steel 36mm Automatic South Africa, Cape Town
Omega Constellation Chronometer Steel SERVICED
R 16 000
Professional dealer
6
ZA
Omega De Ville Prestige 424.13.40.20.02.001 Very good Steel 39.5mm Automatic South Africa, Johannesburg
Omega De Ville Prestige Co-Axial 39.5mm
R 33 999
Free shipping
Professional dealer
149
ZA
Tudor Black Bay Dark M79230DK-0007 Very good Steel 41mm Automatic South Africa, Pretoria
Tudor Black Bay Dark
R 54 900
Professional dealer
21
ZA
Rolex Yacht-Master II 116688-0002 Very good Yellow gold 44mm Automatic
Rolex Yacht-Master II 116688 Eu, 11/2018, like new, Full Set,...
R 672 299
Professional dealer
88
DE
Hublot Classic Fusion Ultra-Thin 545.OX.2210.LR New Rose gold 45mm Manual winding
TOP
Hublot Classic Fusion, new, ultra-thin, rose gold, manual wind...
R 251 370
Professional dealer
58
CH
Omega Seamaster 300 233.90.41.21.03.001 Very good Titanium 41mm Automatic
Omega Seamaster 300 Master Co-Axial Automatik 233.90.41.21.03....
R 107 423

Sold by Chrono24

DE
Breitling Old Navitimer D13322 Good Gold/Steel Automatic South Africa, Johannesburg
Breitling Navitimer Chronograph Automatic 18K Gold
R 72 461
Free shipping
Professional dealer
13
ZA
Omega Seamaster Planet Ocean Chronograph 232.30.46.51.01.001 Very good Steel Automatic South Africa, Centurion
Omega Seamaster Planet Ocean
R 87 000
Professional dealer
26
ZA
Rolex Datejust 126334 Unworn White gold 41mm Automatic
Rolex 126334 Datejust 41 Dark Rhodium Dial 2020 Stainless Steel
R 192 674
Professional dealer
272
US
Omega Constellation 2852 Good Gold/Steel 35mm Automatic South Africa, Cape Town
Omega Constellation 2852-5 SC c.1955
R 30 000
Professional dealer
6
ZA
Breitling Transocean Unitime Pilot AB0510U6/BC26/159A Good Steel 46mm Automatic South Africa, Johannesburg
Breitling Transocean Unitime Pilot 46mm
R 99 999
Free shipping
Professional dealer
149
ZA
Omega Constellation Men 123.20.38.21.08.001 Good Gold/Steel 38mm Automatic South Africa, Pretoria
Omega Constellation
R 56 900
Professional dealer
21
ZA
Rolex Day-Date 36 18238 Very good Yellow gold 36mm Automatic
Rolex Day-Date President Diamond Bezel {2.85 ct / 7pts} 18k...
R 339 680
Professional dealer
28
CA
Breguet Reine de Naples 9807ST/5W/J50 New Steel 32.7mm Automatic
TOP
Breguet Reine de Naples, new, white mother-of-pearl dial,...
R 188 330
Professional dealer
58
CH
Ebel 1911 BTR E9137L73 Very good Steel 44mm Automatic
Ebel 1911 Chronograph Automatik Datum Edelstahl Herrenuhr Ref....
R 31 727

Sold by Chrono24

DE
Ball Engineer Hydrocarbon Nedu DC3026A-S3CJ-BE New Titanium 42mm Automatic
TOP
Ball Engineer Hydrocarbon NEDU
R 59 177
Free shipping
Professional dealer
142
JP
Omega Seamaster Planet Ocean Chronograph 232.32.46.51.01.005 Very good Steel 45.5mm Automatic South Africa, Centurion
Omega Seamaster Planet Ocean
R 74 900
Professional dealer
26
ZA
Rolex Submariner (No Date) 124060 Unworn Steel 41mm Automatic
Rolex Submariner 124060 41mm No Date Stainless Steel IN STOCK
R 201 370
Professional dealer
272
US
Omega Constellation Day-Date 168.029 Very good Yellow gold 35mm Automatic South Africa, Cape Town
Omega Constellation "18K Gold C-Case" Cal.751
R 50 000
Professional dealer
6
ZA
Breitling Navitimer D23322 Very good Gold/Steel 41.8mm Automatic South Africa, Johannesburg
Breitling Navitimer Silver & YG Dial Brown Leather Strap...
R 59 999
Free shipping
Professional dealer
149
ZA
Breitling Chronomat AB0111 Good Steel 44mm Automatic South Africa, Pretoria
Breitling Chronomat
R 59 900
Professional dealer
21
ZA
Rolex Datejust 126334 Unworn White gold 41mm Automatic
Rolex Datejust / Ungetragen / 2021
R 206 052
Professional dealer
18
DE
Breguet GJ24BB8548DDC3 New White gold Automatic
TOP
Breguet Secret de la Reine, paved with 595 diamonds, folding...
R 780 113
Professional dealer
58
CH
Omega Seamaster Planet Ocean 232.92.46.21.03.001 Very good Titanium 45.5mm Automatic
Omega Seamaster Planet Ocean Automatik Titan Ref. 232.92.46.21...
R 81 904

Sold by Chrono24

DE

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.