Rolex. A Stainless Steel Automatic Wristwatch with Center Seconds Signed Rolex, Oyster Perpetual, Explorer, Ref. 1016, Case No. 2'173'364, Circa 1968Cal. 1570 automatic movement, 26 jewels, black matte dial, luminous baton, Arabic, and dagger numerals, luminous hands, center seconds, outer minute divisions, tonneau-shaped water-resistant-type case, screw down crown, screw back, case, dial, and movement signed35mm diam.