Vacheron Constantin

Ref: 6782, "Turnograph"
Fine and very rare, self-winding, 18K yellow gold wristwatch with date and bi-directional rotating bezel
Made circa 1960
DIAM: 35,5 mm
Dial, case and movement signed
Note:  This reference was produced in a series of fewer than 100 pieces, with different bezels and dials, making it incredibly rare 
A similar watch was sold by Antiquorum see "The Quarter of Millennium of Vacheron Constantin", April 2005.