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Eberhard & Co. Tazio Nuvolari Eberhard & Co Tazio Nuvolari 31030 Movimento Gravè Oro New Steel 39.5mm Automatic
TOP
Eberhard & Co. [Rare] Tazio Nuvolari Gold Movement
R 222 660
Verified Dealer
 
IT
Casio G-Shock New Plastic 45mm Quartz
TOP
Casio Reloj Casio G-Shock Hombre GW-3000M-4AER
R 5 426
Verified Dealer
71
ES
Omega De Ville Hour Vision 433.33.41.22.03.001 New Steel 41mm Automatic
TOP
Omega De Ville Hour Vision
R 139 119
Verified Dealer
22
IT
Chopard L.U.C 161927-1001 New White gold 43mm Automatic
TOP
Chopard L.U.C Lunar One 161927-1001
R 620 337
Free shipping
Verified Dealer
48
DE
Omega Constellation 167.005/6 Automatik Chronometer Very good Yellow gold 35mm Automatic
TOP
Omega Constellation 18K Gold Automatic Service 04/2020
R 155 376
Verified Dealer
538
DE
TAG Heuer Kirium WL5113 Good Steel 38mm Quartz South Africa, Waterfall
TAG Heuer Kirium
R 12 000
Private Seller
ZA
Rolex Daytona 16523 Very good Gold/Steel 40mm Automatic
TOP
Rolex 2000 Rolex Daytona Zenith 40mm INVERTED 6 SIX Diamond...
R 233 763
Verified Dealer
542
US
Omega Seamaster Aqua Terra 220.12.38.20.02.001 Good Steel 38mm Automatic
Omega シーマスター アクアテラ 150M コーアクシャル マスタークロノメーター 220.12.38.20.02.001
R 62 667
Free shipping
Verified Dealer
822
JP
Breitling Transocean Chronograph 38 A4131012/G757 Very good Steel 38mm Automatic South Africa, Cape Town
Breitling Transocean Chronograph 38
R 76 000
Verified Dealer
 
ZA
Rolex Very good Gold/Steel 32mm Automatic
TOP
Rolex Men's Rolex Oyster Perpetual Ref.3372 32mm 18k & ss...
R 86 822
Free shipping
Verified Dealer
679
US
Breitling Transocean Chronograph AB015212/BA99/435X/A20BA.1 Very good Steel 43mm Automatic South Africa, Johannesburg
Breitling Transocean Chronograph 43mm Steel on rubber
R 42 999
Verified Dealer
ZA
Omega Speedmaster HB-SIA 321.92.44.52.01.001 Very good Titanium 44,2mm Automatic
TOP
Omega Speedmaster HB-SIA Co-Axial GMT [SPECIAL OFFER]
R 95 676
Verified Dealer
1538
ES
Omega De Ville Co-Axial 1681057 Very good Rose gold 37mm Automatic
TOP
Omega De Ville Caliber 2500 Co-Axial Chronometer 18K 750 Rose...
R 65 145
Free shipping
Verified Dealer
677
NL
Rolex Air King 114234 Good Steel 34mm Automatic South Africa, Cape Town
Rolex Air King
R 89 999
Verified Dealer
 
ZA
B.R.M MK44 New 44mm Automatic
TOP
B.R.M MK 44
R 128 346
Verified Dealer
53
FR
Breitling Navitimer World A24322 Good Steel 46mm Automatic South Africa, Pretoria
Breitling Navitimer World
R 56 900
Verified Dealer
12
ZA
Sinn 103 103.0619 New Steel 41mm Automatic
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
R 47 643
Verified Dealer
103
DE
Rolex Datejust 126334 Very good Steel 41mm Automatic South Africa, Centurion
Rolex Datejust
R 159 500
Verified Dealer
 
ZA
Breguet Classique 5140BA/12/9W6 New Yellow gold 40mm Automatic
TOP
Breguet Classique 40
R 210 882
Verified Dealer
46
CH
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
Verified Dealer
31
ZA
Jaeger-LeCoultre Geophysic True Second Q8012520 Very good Rose gold 39.6mm Automatic
TOP
Jaeger-LeCoultre Geophysic True Second
R 203 019
Verified Dealer
1538
ES
Chopard Mille Miglia 168588-3001 Very good Steel 39mm Automatic
TOP
Chopard Classic Racing Mill Automatic Chronograph Miglia - 16858
R 49 588
Free shipping
Verified Dealer
677
NL
Tissot Touch T075.220.11.106.00 New Steel 39,5mm Quartz
TOP
Tissot Touch Solar Mother Diamond
R 14 760
Verified Dealer
165
ES
Breitling Chronomat 44 GMT AB042011/BB56 Very good Steel 44mm Automatic
Breitling Chronomat 44 GMT
R 109 289
Verified Dealer
 
UK
Breitling Bentley 6.75 A44362 Good Steel 48mm Automatic South Africa, Pretoria
Breitling Bentley 6.75
R 69 900
Verified Dealer
12
ZA
Omega Speedmaster Professional Moonwatch 311.92.44.51.01.007 New Ceramic 44.2mm Automatic
Omega Speedmaster - Dark Side of the Moon - DSOM
R 153 267
Free shipping
Verified Dealer
366
US
Rolex GMT-Master II 16710T Good Steel 40mm Automatic South Africa, Centurion
Rolex GMT-Master II
R 187 000
Verified Dealer
 
ZA
Breguet GJ24BB8548DDC3 New White gold Automatic
TOP
Breguet Secret de la Reine
R 898 841
Verified Dealer
46
CH
Omega Constellation Ladies 123.25.31.20.55.002 Very good Gold/Steel 31mm Automatic South Africa, Johannesburg
Omega Constellation Ladies 31mm 18k Yellow Gold&Steel MOP Diamond
R 98 999
Verified Dealer
31
ZA
Breitling Transocean Unitime Pilot AB0510U6/BC26/159A New Steel 46mm Automatic
TOP
Breitling Transocean Unitime Pilot
R 133 596
Verified Dealer
1538
ES
Rolex Datejust 126334 Very good Steel 41mm Automatic
Rolex Date just 41 126334 LC100 rhodium like new box/papers TOP
R 194 269
Verified Dealer
37
DE
Rolex Sea-Dweller 126600 New Steel 43mm Automatic
Rolex Sea-Dweller 50th Year Anniversary 126600
R 237 254
Free shipping
Verified Dealer
156
US
Omega De Ville Hour Vision 431.63.41.22.13.001 Very good Rose gold 41mm Automatic
Omega De Ville Hour Vision Annual Calendar Red Gold
R 270 304
Verified Dealer
23
FI
Breitling Chronomat AB0111 Good Steel 44mm Automatic South Africa, Pretoria
Breitling Chronomat
R 59 900
Verified Dealer
12
ZA
Omega Seamaster Aqua Terra 220.12.41.21.03.002 New Steel 41mm Automatic
Omega Aqua Terra 8900 41mm Slate Blue Dial Omega 5 Year Warranty
R 75 748
Free shipping
Verified Dealer
366
US
Montblanc 36915 Montblanc, Soulmakers 100 Years Very good Tantalum 44mm Automatic South Africa, Centurion
Montblanc Soulmakers
R 110 000
Verified Dealer
 
ZA
Breguet Reine de Naples 8908BB/52/864.D00D New White gold Automatic
TOP
Breguet Reine de Naples
R 421 856
Verified Dealer
46
CH
Omega Constellation Double Eagle 1514.20.00 Good Steel 41.5mm Automatic South Africa, Johannesburg
Omega Constellation Double Eagle 41mm Steel
R 44 999
Verified Dealer
31
ZA
Omega Constellation Double Eagle 121.32.44.52.01.001 New Steel 44mm Automatic
TOP
Omega Constellation Double Eagle Day-Date Chrono (SPECIAL OFFER)
R 102 968
Verified Dealer
1538
ES
Rolex Daytona 116515ln New Rose gold 40mm Automatic
Rolex Daytona
R 554 578
Verified Dealer
21
US
Omega Seamaster Planet Ocean 215.62.40.20.13.001 New Ceramic 39.5mm Automatic
Omega Planet Ocean 600m Co-Axial Master Chronometer 39.5mm -...
R 148 837
Verified Dealer
13
US
Rolex Submariner Date 116610LN Unworn Steel 40mm Automatic
Rolex Submariner Date
R 213 520
Verified Dealer
11
DE
Breitling Montbrillant A41330 Good Steel 38mm Automatic South Africa, Pretoria
Breitling Montbrillant
R 42 900
Verified Dealer
12
ZA
Omega Speedmaster Racing 329.30.44.51.04.001 New Steel Automatic
Omega Speedmaster Racing - White Dial - 2020 Omega 5 Year...
R 119 601
Free shipping
Verified Dealer
366
US
Omega Seamaster Planet Ocean Chronograph 222.18.38.50.01.001 Unworn Steel South Africa, Paarl
Omega Seamaster Planet Ocean Chronograph
R 97 900
Verified Dealer
 
ZA
Chaumet Liens W23870-02A New Rose gold 33mm Automatic
TOP
Chaumet Liens 33
R 106 386
Verified Dealer
46
CH
Omega Seamaster Planet Ocean Chronograph 215.30.46.51.01.001 Good Steel 45.5mm Automatic South Africa, Johannesburg
Omega Seamaster Planet Ocean Chronograph 45.5mm
R 59 999
Verified Dealer
31
ZA
Breitling Superocean Héritage A37320 Very good Steel 38mm Automatic
Breitling Super Ocean Heritage 38mm
R 45 699
Verified Dealer
1458
NL
Omega De Ville Hour Vision 431.33.41.21.02.001 Unworn Steel 41mm Automatic
Omega De Ville Hour Vision
R 81 674
Verified Dealer
15
NL
Rolex Sea-Dweller 16600T Very good Steel 40mm Automatic
Rolex Sea-Dweller
R 186 047
Verified Dealer
5
US
Omega Seamaster 168.1501 Very good Gold/Steel 36mm Automatic
Omega Seamaster
R 27 128
Verified Dealer
11
DE
Breitling Superocean II 44 A17392 Good Steel 44mm Automatic South Africa, Pretoria
Breitling Superocean II 44
R 39 900
Verified Dealer
12
ZA
Omega Seamaster Planet Ocean 215.30.44.21.01.001 New Steel 43.5mm Automatic
Omega Planet Ocean 8900 43.5mm Black - 2020 5 Year Omega...
R 88 151
Free shipping
Verified Dealer
366
US
Breitling Chronospace Military M7836622.BD39.159M Very good Steel Quartz South Africa, Centurion
Breitling Chronospace Military
R 54 000
Verified Dealer
 
ZA
Chaumet Liens W23871-02A New Rose gold 33mm Automatic
TOP
Chaumet Liens 33
R 143 077
Verified Dealer
46
CH
Breitling Super Avenger A1337011/C757 Very good Steel 48mmmm Automatic South Africa, Johannesburg
Breitling Super Avenger 48MM
R 47 841
Verified Dealer
31
ZA
Omega Seamaster Planet Ocean 2200.51.00 Good Steel 45.5mm Automatic
Omega Seamaster Planet Ocean
R 52 505
Verified Dealer
15
DE
Omega Seamaster Aqua Terra 231.13.39.21.57.001 Omega Seamaster Aqua Terra, black MOP New Steel 38.5mm Automatic
Omega Seamaster Aqua Terra
R 106 955
Verified Dealer
15
NL
Rolex Explorer II 16570 Very good Steel 40mm Automatic
Rolex Explorer II Black
R 115 705
Verified Dealer
1458
NL
Rolex Datejust 126334 Gold/Steel 41mm Automatic
Rolex 126334 Datejust 41 Wimbledon - White Gold Bezel Complete...
R 191 448
Free shipping
Verified Dealer
165
UK
Breitling a49350L2/ba07 Good Steel 41mm Automatic South Africa, Pretoria
Breitling Cockpit 41
R 59 900
Verified Dealer
12
ZA
Omega Seamaster Diver 300 M 210.30.42.20.03.001 New Steel 42mm Automatic
Omega Seamaster 300M - 42mm - Blue Wave Dial - Omega 5yr Warranty
R 75 305
Free shipping
Verified Dealer
366
US
Omega Seamaster Planet Ocean Chronograph 232.30.46.51.01.003 Very good Steel Automatic South Africa, Centurion
Omega Seamaster Planet Ocean Chronograph
R 75 900
Verified Dealer
 
ZA
Omega Constellation 2852-3 Very good Gold/Steel 36mm Automatic
Omega Constellation vintage Pie Pan with cross hair dial
R 67 965
Verified Dealer
11
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.