Zenith "Chronograph Automatic El Primero", Case No. 904D837, Cal. 3019 PHC, 37 x 46 mm, circa 1975

A gentleman's rare automatic wristwatch with chronograph and date indicator
Case: steel, screw back Dial: silvered, applied luminous indexes, auxiliary seconds, 30 min. and 12h counter, date window between "4" and "5", luminous baton hands. Movm.: rotorwind movement, rhodium-plated, ground, finely ground chronograph steel parts, ratchet wheel, Glucydur balance, shock protection for balance.