Le Coultre "Automatic Deep Sea Master Mariner", Movement No. 1906066, Ref. E558, Cal. 883, 37 mm, circa 1970

A gentleman's rare automatic diver's wristwatch with date. The Master Mariner Plongeur reference E.558, was made in only 1532 examples from 1968 to 1971.
Case: steel, screw back, turnable index bezel via crown. Dial: black, luminous indexes, centre seconds, luminous baton hands. Movm.: rotorwind movement, rhodium-plated, ground, 17 jewels, Glucydur balance, shock protection for balance.