Model: Military Submariner Reference: 5513 Date: Circa 1972 Movement: 26-jewel Cal.1520 automatic, free-sprung Gyromax balance Dial: Black, Tritium T, luminous dot hour markers, baton quarters, white outer minute divisions, broad polished sword hands with luminous inserts, arrow tipped centre seconds Case: Brushed and polished tonneau form, screw down Oyster back and shouldered crown, inside back date coded I.72 and engraved with serial number, black calibrated military bezel insert, fixed bar lugs, 5517 engraved to back of lug, No.3926898 Strap/Bracelet: Associated brushed and polished rivet link Buckle/Clasp: Associated folding clasp, stamped DE6 and 93250 Signed: Case, dial & movement Size: 39mm 注脚 In the early 1970s, the British Ministry of Defence commissioned a very limited batch of Rolex reference 5513 Submariners, designed to enhanced specifications to meet the demands of their Special Forces. These "Military Submariners", or "MilSubs", differ in many ways from standard production pieces. They feature thicker, sword-shaped hands for enhanced legibility, a rotating bezel calibrated to 60 minutes, an encircled "T" on the dial indicating the use of luminescent Tritium, and solid steel bars fixed between the lugs. Military watches are then engraved with various numbers denoting the regiment and force that the watch was issued to. When purchased from a friend, the current owner chose to have these numbers polished off.