Model: Comex Submariner Reference: 5513 Date: Circa 1975 Movement: 26-jewel Cal.1520 automatic, free-sprung Gyromax balance Dial: Black, luminous dot hour markers, baton quarters, white outer minute divisions, polished Mercedes hands with luminous inserts, centre seconds Case: Brushed and polished tonneau form, screw down back engraved COMEX 247, helium escape valve at 9, shouldered screw down crown, bi-directional bezel with black calibrated insert, inner case stamped IV.71, No.779 Strap/Bracelet: Fitted brushed 93150 Oyster link Buckle/Clasp: Signed folding clasp, stamped L10 Signed: Case, dial & movement Size: 39mm Accompaniments: Original glass 注脚 The collaboration between the world famous French diving company Comex (Compagnie Maritime d'Expertise) and Rolex started in early 1971. As the diving development continued, Rolex continued to collaborate and test their watches with the use of professional divers as well as using Submariners. Each watch issued to their specialist divers was marked Comex on the dial and numbered on the back.