Vacheron Constantin. A fine and unusual 18K gold openface keyless lever watch with Breguet numerals and two-tone dial

Vacheron Constantin. A fine and unusual 18K gold openface keyless lever watch with Breguet numerals and two-tone dial
Signed Vacheron & Constantin, Genève, movement no. 3'393'856, case no. 268'703, manufactured in 1940
Mechanical movement, 18 jewels, bimetallic compensation balance, white and grey matte dial, applied Breguet numerals, outer beady minute division, engine-turned subsidiary dial for constant seconds, circular case, snap on back, inside case back engraved "20 Nov. 1940", outside case back centered with monogram EG, case, dial and movement signed
41 mm. diam.