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Franck Muller 18Kt Perpetual Calendar Moon folding closure
TOP
Franck Muller 18Kt Perpetual Calendar Moon folding closure
฿541,195
Seller
Ingo Freiherr von Seld
9
DE
Rolex Pearlmaster Datejust 69318
TOP
Rolex Pearlmaster Datejust 69318
฿573,753
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
222
UK
Rolex Datejust Edelstahl/ Gelbgold Oysterarmband Automatic...
TOP
Rolex Datejust Edelstahl/ Gelbgold Oysterarmband Automatic...
฿135,105
Seller
Timeless Watches GmbH
230
DE
Omega Seamaster Planet Ocean CO-AXIAL 45.5 MM
Omega Seamaster Planet Ocean CO-AXIAL 45.5 MM
฿132,000
Seller
Private Seller
TH
TAG Heuer Grand Carrera Caribre6
TAG Heuer Grand Carrera Caribre6
฿92,180
Seller
World Wide Watch Shop
TH
Blancpain Villeret 7002 Chronometer
Blancpain Villeret 7002 Chronometer
฿115,224
Seller
Private Seller
TH
Gérald Genta Sport Retro Steel & Rubber Full Set Box + Papers
TOP
Gérald Genta Sport Retro Steel & Rubber Full Set Box + Papers
฿84,199
Free shipping
Seller
Pawndeluxe
168
NL
Omega CONSTELLATION OMEGA CO-AXIAL 38 MM ROSE GOLD
TOP
Omega CONSTELLATION OMEGA CO-AXIAL 38 MM ROSE GOLD
฿406,438
Seller
Plus Watch - Luxury Watches
2935
IT
Omega CONSTELLATION DOUBLE EAGLE CHRONOMETER DIAMONDS LADY LADIES
TOP
Omega CONSTELLATION DOUBLE EAGLE CHRONOMETER DIAMONDS LADY LADIES
฿270,334
Seller
A.S. INVESTMENTS SP. Z O.O.
125
PL
Rolex Day-Date 1803 Vintage
Rolex Day-Date 1803 Vintage
฿195,000
Seller
Northeasternclassics
TH
Sinn 103 St Sa RB Classic Watch Sondermodell
TOP
Sinn 103 St Sa RB Classic Watch Sondermodell
฿94,845
Seller
Classic Watch
21
DE
Rolex Lady Datejust Lapis 18K GOLD GELBGOLD DAMENUHR
TOP
Rolex Lady Datejust Lapis 18K GOLD GELBGOLD DAMENUHR
฿251,242
Seller
Timeless Watches GmbH
230
DE
Rolex GMT-Master II 116759SARU june 2020 Rolex warranty
TOP
Rolex GMT-Master II 116759SARU june 2020 Rolex warranty
฿2,400,150
Seller
MMC RIVIERA
6
MC
Ball Engineer II Magneto S
Ball Engineer II Magneto S
฿108,640
Seller
World Wide Watch Shop
TH
Breitling Colt Chronograph Box&Papers/2005, Steel Quartz MINT
TOP
Breitling Colt Chronograph Box&Papers/2005, Steel Quartz MINT
฿50,326
Seller
M.J.WATCHES
150
BE
Omega Speedmaster Professional Moonwatch Ref 311.33.44.51.01.001
Omega Speedmaster Professional Moonwatch Ref 311.33.44.51.01.001
฿210,317
Seller
Horlogerie Desbiolles
 
CH
Rolex “Four-Line” “Zenith” Daytona Ref. 16520 in Steel
Auction
Rolex “Four-Line” “Zenith” Daytona Ref. 16520 in Steel
฿592,582
Estimated price
Seller
Fortuna
 
Ulysse Nardin ACQUA PERPETUAL CALENDAR MARINE DIVER 300M
TOP
Ulysse Nardin ACQUA PERPETUAL CALENDAR MARINE DIVER 300M
฿310,897
Seller
A.S. INVESTMENTS SP. Z O.O.
125
PL
Rolex GMT-Master Vintage UAE Air Force 1675
Rolex GMT-Master Vintage UAE Air Force 1675
฿4,113,702
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
222
UK
Rolex Datejust II Diamond Sundust Dial Jubilee Rose Gold
Rolex Datejust II Diamond Sundust Dial Jubilee Rose Gold
฿414,281
Seller
Ahead Of Time Sunny Isles LLC
9
US
F.P.Journe Tourbillon Souverain Dead Seconds Platinum
F.P.Journe Tourbillon Souverain Dead Seconds Platinum
฿3,550,774
Free shipping
Seller
M J GILLAN LTD
10
UK
Rolex Sea-Dweller 43mm Stainless Steel Watch 126600
Rolex Sea-Dweller 43mm Stainless Steel Watch 126600
฿439,499
Free shipping
Seller
Wrist Aficionado
 
US
Omega Seamaster Automatic Chrono
Omega Seamaster Automatic Chrono
฿94,845
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
254
DE
Rolex Datejust 16233 36 mm Gold Stahl silber Zifferblatt
Rolex Datejust 16233 36 mm Gold Stahl silber Zifferblatt
฿183,882
Seller
KLASSISCHE UHREN KRETZSCHMAR
23
DE
Ulysse Nardin El Toro / Black Toro, Perpetual Calendar, GMT,...
Ulysse Nardin El Toro / Black Toro, Perpetual Calendar, GMT,...
฿792,998
Seller
Horlogerie Desbiolles
 
CH
Rolex Explorer II Ref. 16550 in Steel
Auction
Rolex Explorer II Ref. 16550 in Steel
฿197,528
Estimated price
Seller
Fortuna
 
Omega Seamaster Aqua Terra 150 M
Omega Seamaster Aqua Terra 150 M
฿115,749
Seller
SW Watches
16
DE
Rolex Submariner Date Steel Green Bezel
Rolex Submariner Date Steel Green Bezel
฿604,065
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
222
UK
Rolex Datejust 41mm  Navy Blue  Index Jubilee 126334
Rolex Datejust 41mm Navy Blue Index Jubilee 126334
฿302,382
Seller
Harley's Time LLC
160
US
Rolex Datejust 126334 Slate Roman
Rolex Datejust 126334 Slate Roman
฿302,876
Seller
Labelle Jewelry
48
US
Breitling Navitimer 01 46mm
Breitling Navitimer 01 46mm
฿202,155
Seller
TIME TO LUXURY.
74
IT
Rolex Daytona
Rolex Daytona
฿472,288
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
254
DE
Rolex Datejust 16620 Jubileeband Edelstahl silber römsich
Rolex Datejust 16620 Jubileeband Edelstahl silber römsich
฿152,913
Seller
KLASSISCHE UHREN KRETZSCHMAR
23
DE
Chopard Mille Miglia 8920 Brescia-Roma-Brescia
Chopard Mille Miglia 8920 Brescia-Roma-Brescia
฿80,908
Seller
Krono Time
 
RO
Rolex Oyster Perpetual Ref. 1002 in Steel
Auction
Rolex Oyster Perpetual Ref. 1002 in Steel
฿49,382
Estimated price
Seller
Fortuna
 
Omega Seamaster 300
Omega Seamaster 300
฿138,976
Seller
SW Watches
16
DE
Rolex Rare Tiffany & Co Explorer I 14270
Rolex Rare Tiffany & Co Explorer I 14270
฿714,485
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
222
UK
Omega Seamaster Diver 300 M Blue dial 212.30.41.20.03.001
Omega Seamaster Diver 300 M Blue dial 212.30.41.20.03.001
฿94,978
Seller
Harley's Time LLC
160
US
Rolex Datejust 41 Blue Index
Rolex Datejust 41 Blue Index
฿300,571
Seller
Labelle Jewelry
48
US
Rolex Deep Sea DLC Black James Cameron Blue Black Dial
Rolex Deep Sea DLC Black James Cameron Blue Black Dial
฿669,719
Seller
Luxus Ritter
88
DE
Rolex Submariner
Rolex Submariner
฿691,011
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
254
DE
Rolex Datejust 116200 Oysterband schwarz Index LC100
Rolex Datejust 116200 Oysterband schwarz Index LC100
฿203,239
Seller
KLASSISCHE UHREN KRETZSCHMAR
23
DE
Breguet Transatlantique Type XX Ref.3800 39mm S/s Flyback
Breguet Transatlantique Type XX Ref.3800 39mm S/s Flyback
฿148,146
Seller
R&R Watches, Inc.
19
US
Rolex Sea-Dweller 43mm 50th Anniversary
Rolex Sea-Dweller 43mm 50th Anniversary
฿454,149
Free shipping
Seller
Pave Jewelers
 
US
Rolex 116660 Sea Dweller Deep Sea (29188)
Rolex 116660 Sea Dweller Deep Sea (29188)
฿337,443
Seller
European Watch Company
159
US
Rolex Explorer I Unworn Steel 114270
Rolex Explorer I Unworn Steel 114270
฿300,950
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
222
UK
Omega Seamaster Diver 300 M Black dial 212.30.41.20.01.003
Omega Seamaster Diver 300 M Black dial 212.30.41.20.01.003
฿94,978
Seller
Harley's Time LLC
160
US
Omega De Ville Prestige 18K Gold Luxusuhr Goldband Unisex...
Omega De Ville Prestige 18K Gold Luxusuhr Goldband Unisex...
฿270,946
Seller
Uhrenkapital
337
DE
Rolex DATEJUST II Special Edition Rainbow Baguette + Diamonds
Rolex DATEJUST II Special Edition Rainbow Baguette + Diamonds
฿451,151
Seller
Luxus Ritter
88
DE
Rolex Yacht Master Damenuhr
Rolex Yacht Master Damenuhr
฿348,409
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
254
DE
Omega Seamaster Railmaster Coaxial 42 mm 2500.5200
Omega Seamaster Railmaster Coaxial 42 mm 2500.5200
฿125,814
Seller
KLASSISCHE UHREN KRETZSCHMAR
23
DE
Omega Seamaster Diver 300 M 41 mm – 212.30.41.20.03.001
Omega Seamaster Diver 300 M 41 mm – 212.30.41.20.03.001
฿92,909
Seller
Mall of the Watch
823
MC
Omega Seamaster Aqua Terra
Omega Seamaster Aqua Terra
฿146,099
Seller
TIME TO LUXURY.
74
IT
Rolex 116610LV Submariner Green Ceramic Bezel Green Dial SS...
Rolex 116610LV Submariner Green Ceramic Bezel Green Dial SS...
฿457,605
Seller
European Watch Company
159
US
Rolex Daytona 116523
Rolex Daytona 116523
฿454,672
Free shipping
Seller
Watches & Jewellery of Bond Street Ltd
222
UK
Omega Seamaster 300 Black Steel 41mm - 233.30.41.21.01.001
Omega Seamaster 300 Black Steel 41mm - 233.30.41.21.01.001
฿136,459
Seller
Harley's Time LLC
160
US
Rolex Datejust Gelbgold 16018 rar Presidentband 18K Gold...
Rolex Datejust Gelbgold 16018 rar Presidentband 18K Gold...
฿329,014
Seller
Uhrenkapital
337
DE
Rolex GMT Matser Vintage Nipple Dial 18K Gold Box Papers Revision
Rolex GMT Matser Vintage Nipple Dial 18K Gold Box Papers Revision
฿1,496,532
Seller
Luxus Ritter
88
DE
Breitling Bentley Supersport
Breitling Bentley Supersport
฿170,333
Free shipping
Seller
A. Grimmeissen Uhren An- und Verkauf
254
DE
Breitling Old Navitimer II Gold Stahl D13322
Breitling Old Navitimer II Gold Stahl D13322
฿121,943
Seller
KLASSISCHE UHREN KRETZSCHMAR
23
DE
Rolex Datejust 41 Jubilee Blue Dial LC-EU
Rolex Datejust 41 Jubilee Blue Dial LC-EU
฿336,795
Free shipping
Seller
Tradeluxe Uhrenhandels GmbH
56
AT
Omega Speedmaster DARK SIDE OF THE MOON
Omega Speedmaster DARK SIDE OF THE MOON
฿310,665
Seller
TIME TO LUXURY.
74
IT
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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.

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