Rolex "Oyster Perpetual Submariner 200m/660ft", Case No. 1625316, Ref. 5513, Cal. 1520, 39 mm, circa 1967

A diver's rare automatic wristwatch
Case: steel, screw back ref. 5513 II/67, reeded turnable bezel, screwed "Triplock" winding crown, riveted steel "Oyster" bracelet, ref. 7206/80. Dial: black, luminous indexes, centre seconds, luminous Mercedes hands. Movm.: rotorwind movement, rhodium-plated, ground, 26 jewels, Glucydur balance, shock protection for balance.

Ref. 5513
Reference 5513 was fist launched in 1962; it was designed to withstand pressure up to 200 meters (660ft) and featured an 8 mm crown with crown guards. The bezel had minute divisions for the first fifteen minutes and a silver triangle. The face of the watch was black with gilt printing. From 1964 on the inscription "Swiss T<25" was added to the bottom of the dial.