Heuer. A stainless steel manual wind chronograph wristwatch Autavia 'Mario Andretti', Ref: 3646...

Heuer. A stainless steel manual wind chronograph wristwatch
Model: Autavia 'Mario Andretti'
Reference: 3646
Date: Circa 1960
Movement: 17-jewel Valjoux Cal.92 manual wind, column wheel chronograph
Dial: Black, applied polished baton hour markers, white outer 1/5th second divisions with luminous 5 minute markers, further outer tachymetre scale, subsidiary dials at 3, and 9 for seconds and 45 minute recording, polished pointed baton hands with luminous inserts, white centre chronograph hand
Case: Polished round, screw down back, crown flanked by twin chronograph pushers, bi-directional bezel with black 24 hour insert, No.88214
Strap/Bracelet: Associated black leather
Buckle/Clasp: Signed steel buckle
Signed: Case, dial & movement
Size: 39mm
Footnotes:
The Autavia 3646 is nicknamed the Mario Andretti after the Italian-American driver received two of them for qualifying fastest at the Indianapolis 500 in both 1966 and 1967.