Swiss nickel deck chronometer with regulator dial Circa 1930

Nickel lever watch in mahogany box
–
An extremely rare Vacheron & Constantin deck chronometer with regulator dial and stoppable seconds “Heure Exacte”, circa 1930. An original 3-part mahogany box with original key compartment, 12 x 11 x 6 cm,  original key, nickel case with screwed bezel, very fine and extremely rare Ankerchronometer according to patent V & C, Guillaume balance, special fine adjusting device, original silvered regulator dial, blued steel hands, in complete original condition with original box and original key, intact, cleaning recommended.
–
Diameter: 82 mm
–
Signed: Vacheron & Constantin  Geneve
–
These Vacheron & Constantin deck chronometers are extremely rare and belong to the most accurate deck chronometers. Some of the boxes had a label “Heure exact” in the lid, the “exact time”! Only very few of these watches are known today, among others the no. 250999. According to the archives sold in 1929 and auctioned in Geneva 2005 in the special auction “The Quarter Millennium of Vacheron & Constantin” for 13,800 Swiss Francs!