3087. Zenith. A stainless steel automatic calendar chronograph wristwatch Zenith. Stainless steel wrist chronograph with date automatic movement Model: El Primero Reference: 01-0210-415 Date: Circa 1970 Movement: 31-jewel Cal.3019 PHC automatic Dial: Silvered, applied polished baton hour markers with black accents and luminous tips, black outer 1/5th second divisions, subsidiary dials at 3, 6 and 9 for seconds, 30 minute and 12 hour recording, date aperture between 4 and 5, polished baton hands with black and luminous accents, centre chronograph hand Case: Brushed and polished tonneau form, screw down back, crown flanked by twin chronograph pushers Strap/Bracelet: Associated blue leather strap Signed: Case, dial & movement Size: 36mm