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Rolex Sea-Dweller Deepsea Blue
Rolex Sea-Dweller Deepsea Blue
R 165,000
Seller
Private seller
UK
Vacheron Constantin Malte Régulateur Dual Time
Vacheron Constantin Malte Régulateur Dual Time
R 268,065
Seller
Rent a Box Schmuck und Uhren AG
 
CH
Graham Chronofighter 43mm Roségold 2CFAR.B10A.C54B
Graham Chronofighter 43mm Roségold 2CFAR.B10A.C54B
R 137,888
Seller
KROMINI GOLD IMPEX S.R.L
 
RO
TAG Heuer Grand Carrera
TAG Heuer Grand Carrera
R 39,396
Seller
Reclaimed Jewels
 
NL
Porsche Design Dashboard Porsche design Chronograph Driver&#39...
Porsche Design Dashboard Porsche design Chronograph Driver'...
R 40,269
Seller
Private seller
ZA
Rolex Sea-Dweller
Rolex Sea-Dweller
R 79,000
Seller
Topwatch SA Pty Ltd
ZA
Breitling Montbrillant Légende
Breitling Montbrillant Légende
R 50,427
Seller
Plinio Gioielli S.R.L.
 
IT
Rolex EXPLORER II so called "Albino"
Rolex EXPLORER II so called "Albino"
R 337,234
Seller
Uhren Schöfer GmbH
DE
Omega Seamaster Planet Ocean - men's wristwatch - 2007
Omega Seamaster Planet Ocean - men's wristwatch - 2007
R 37,821
Estimated price
Seller
Catawiki BV
 
Montblanc Meisterstück
Montblanc Meisterstück
R 18,895
Seller
Private seller
 
HU
Hublot 301.AI.460.RX
Hublot 301.AI.460.RX
R 136,425
Seller
Deluxe ( Asia ) Ltd
 
HK
Rolex Submariner
Rolex Submariner
R 99,388
Seller
SWISSTIME.DK
 
DK
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 1,641,735
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
54
UK
Rolex Yacht-Master II 44 mm Steel
Rolex Yacht-Master II 44 mm Steel
R 147,653
Seller
Lombard Perspectiva
RU
Rolex Daytona (White dial)
Rolex Daytona (White dial)
R 203,057
Seller
Private seller
 
UK
Breitling Navitimer Heritage
Breitling Navitimer Heritage
R 45,227
Seller
Private seller
 
RO
Rolex GMT-MASTER II  Tritium
Rolex GMT-MASTER II Tritium
R 211,165
Seller
Uhren Schöfer GmbH
DE
Breitling Chronomat 41 Rosegold/Steel Full Set Unworn
Breitling Chronomat 41 Rosegold/Steel Full Set Unworn
R 93,764
Seller
Private seller
 
BE
IWC Portuguese Chronograph
IWC Portuguese Chronograph
R 70,898
Seller
Private seller
 
PT
Omega Prestige Chronometer 18k gold
Omega Prestige Chronometer 18k gold
R 36,245
Estimated price
Seller
Catawiki BV
 
Rolex Sea-Dweller
Rolex Sea-Dweller
R 244,258
Seller
Private seller
 
SI
Tudor Black Bay Dark
Tudor Black Bay Dark
R 52,767
Seller
SWISSTIME.DK
 
DK
Omega Seamaster Planet Ocean Titan
Omega Seamaster Planet Ocean Titan
R 60,671
Seller
Private seller
 
AT
Ball for BMW Power Reserve
Ball for BMW Power Reserve
R 27,420
Seller
Private seller
 
DE
Louis Moinet Tempograph
Louis Moinet Tempograph
R 172,814
Seller
Private seller
 
UK
A. Lange & Söhne Savonette  ALS  1B,  14 Kt,  Top=Wie Neu,...
A. Lange & Söhne Savonette ALS 1B, 14 Kt, Top=Wie Neu,...
R 77,217
Seller
Private seller
 
DE
Rolex Sea-Dweller Deepsea
Rolex Sea-Dweller Deepsea
R 188,945
Seller
Private seller
 
DE
Montblanc 1858 Monopusher Chronograph Limited Edition
Montblanc 1858 Monopusher Chronograph Limited Edition
R 213,425
Seller
Private seller
 
CH
Omega - Seamaster Aqua Terra - Men's watch
Omega - Seamaster Aqua Terra - Men's watch
R 48,852
Estimated price
Seller
Catawiki BV
 
Omega Seamaster Diver 300 M
Omega Seamaster Diver 300 M
R 44,124
Seller
Private seller
 
DE
Rolex Oyster Perpetual Datejust Stainless Steel Silver Face...
Rolex Oyster Perpetual Datejust Stainless Steel Silver Face...
R 44,900
Seller
La Jolla Jewelry and Collateral Loan Company
7
US
Baume & Mercier Classima XL Chronograph Executives
Baume & Mercier Classima XL Chronograph Executives
R 20,329
Seller
Private seller
 
DE
Rolex Datejust 41 NEW Ref. 126334
Rolex Datejust 41 NEW Ref. 126334
R 122,917
Seller
Steiner Maastricht
46
NL
Audemars Piguet Royal Oak Rubens Barrichello II Limited...
Audemars Piguet Royal Oak Rubens Barrichello II Limited...
R 937,517
Seller
Private seller
 
UK
Doxa Anti-Magnetic Chronograph
Doxa Anti-Magnetic Chronograph
R 2,206
Seller
Private seller
 
HU
Omega Seamaster Aqua Terra
Omega Seamaster Aqua Terra
R 117,401
Seller
Private seller
 
DE
Rolex Daytona
Rolex Daytona
R 362,447
Seller
Private seller
 
IT
Omega Constellation Chronometer, Men's Wristwatch, 1968
Omega Constellation Chronometer, Men's Wristwatch, 1968
R 13,395
Estimated price
Seller
Catawiki BV
 
Rolex Datejust art. Rs184bj
Rolex Datejust art. Rs184bj
R 39,396
Seller
Stroppiana SRL
200
IT
Rolex Sea-Dweller Red / Ref. 126600 NEW UNWORN / FULL-SET / LC EU
Rolex Sea-Dweller Red / Ref. 126600 NEW UNWORN / FULL-SET / LC EU
R 188,315
Seller
DIAMANDO
 
DE
Rolex Oyster Perpetual Datejust Diamonds Yellow Gold S/steel...
Rolex Oyster Perpetual Datejust Diamonds Yellow Gold S/steel...
R 73,088
Seller
La Jolla Jewelry and Collateral Loan Company
7
US
Breitling Chronomat 44 Airborne
Breitling Chronomat 44 Airborne
R 59,095
Seller
Private seller
 
DE
Rolex Daytona Cosmograph Daytona 40mm Everose Gold
Rolex Daytona Cosmograph Daytona 40mm Everose Gold
R 293,963
Seller
Lombard Perspectiva
RU
Rolex Sea-Dweller Steel Deepsea D-Blue 'James Cameron'...
Rolex Sea-Dweller Steel Deepsea D-Blue 'James Cameron'...
R 172,556
Seller
M.J.WATCHES
45
BE
Junghans Meister Chronoscope
Junghans Meister Chronoscope
R 19,698
Seller
Private seller
 
FR
Rolex Explorer I Edelstahl 214270 Automatik 39 mm
Rolex Explorer I Edelstahl 214270 Automatik 39 mm
R 69,180
Seller
Juwelier Rieger
87
DE
IWC Ingenieur Chronograph Edition "74th Members Meeting at...
IWC Ingenieur Chronograph Edition "74th Members Meeting at...
R 245,396
Seller
Private seller
 
UK
IWC Ingenieur 3521 unisex watch.
IWC Ingenieur 3521 unisex watch.
R 39,396
Estimated price
Seller
Catawiki BV
 
Rolex GMT II Ceramica Ref. 116710 02/2011 art. Rg823
Rolex GMT II Ceramica Ref. 116710 02/2011 art. Rg823
R 103,219
Seller
Stroppiana SRL
200
IT
Rolex Oyster Perpetual Datejust Copper Salmon Dial Steel Watch
Rolex Oyster Perpetual Datejust Copper Salmon Dial Steel Watch
R 30,403
Seller
La Jolla Jewelry and Collateral Loan Company
7
US
Rolex Air King 40 Ref. 116900 aus 2017
Rolex Air King 40 Ref. 116900 aus 2017
R 83,520
Seller
Uhren2000 GmbH
202
DE
Rolex Explorer 6610 steel
Rolex Explorer 6610 steel
R 204,785
Seller
A Collected Man
5
UK
Rolex Explorer II
Rolex Explorer II
R 393,965
Seller
2GTime
 
CH
Rolex Oyster Perpetual Datejust 41 126334 NEW MODEL
Rolex Oyster Perpetual Datejust 41 126334 NEW MODEL
R 114,250
Seller
Filipucci Juweliers
249
NL
Montblanc Timewalker Twinfly Greytech Titanium Chrono
Montblanc Timewalker Twinfly Greytech Titanium Chrono
R 80,538
Seller
Private seller
 
US
Rolex DayDate 18238 Gelbgold 750 automatik 36mm DayDate
Rolex DayDate 18238 Gelbgold 750 automatik 36mm DayDate
R 157,428
Seller
Juwelier Rieger
87
DE
Rolex Oyster Perpetual
Rolex Oyster Perpetual
R 72,704
Seller
Private seller
 
SE
Clerc Hydroscaph  Chronometer H1 -1.B.3
Clerc Hydroscaph Chronometer H1 -1.B.3
R 83,284
Seller
Private seller
 
DE
Baume & Mercier Capeland Ref. 65716
Baume & Mercier Capeland Ref. 65716
R 30,729
Seller
Private seller
 
DE
Omega Seamaster 300m chronometer Chronograph America's Cup...
Omega Seamaster 300m chronometer Chronograph America's Cup...
R 63,034
Estimated price
Seller
Catawiki BV
 

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.