Model: Explorer Reference: 5504 Date: Circa 1958 Movement: 25-jewel Cal.1530 automatic, No.28*** Dial: Black, luminous baton hour markers, Arabic numeral quarters, outer minute divisions with five minute markers, later blued steel hands with luminous inserts, centre seconds Case: Brushed and polished tonneau form, screw down Oyster back and crown, inside back date coded II.1958, No.281*** Strap/Bracelet: Polished rivet Oyster 6636 link Buckle/Clasp: Signed folding clasp stamped 4 69 Signed: Case, dial & movement Size: 36mm Accompaniments: Spare Oyster 78360 link bracelet stamped M5, Rolex pouch