Swiss Heure Exacte deck chronometer with regulator dail Circa 1930

Deck chronometer by Vacheron & Constantin 
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An extremely rare Swiss deck chronometer with regulator dial and stoppable seconds, Heure Exacte, circa 1930. Very fine ankerchronometer according to patent V & C 101652, Guillaume balance, special fine adjusting device. Silvered regulator dial with Arabic hours and outer minute divisions, subsidiary seconds, blued steel hands. Three-part mahogany box with original key compartment, original key, nickel case with screwed bezel. Case numbered, dial signed, movement signed and numbered.
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Dimensions: 12 x 11 x 6 cm
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Diameter case: 82 mm
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Signed: Vacheron & Constantin Genève Suisse
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These Vacheron & Constantin deck chronometers belong to the most accurate deck chronometers. Some of the boxes had a label ‘Heure Exact’, the ‘Exact Time’! Only very few of these watches are known today, among others No. 250999.