ROLEX SUBMARINER REF 6536/1 GILT tropical DIAL STEEL Rolex, "Oyster Perpetual, 100m=330ft, Submariner", case No. 306551, Ref 6536/1. Made in 1957 Fine and very rare, center seconds, self-winding, water-resistant, stainless steel wristwatch with a stainless steel riveted Rolex Oyster bracelet with deployant clasp Three-body, polished and brushed, graduated bi-directional revolving black bezel for the decompression times, screwed-down case back and crown Black with luminous baton, triangular and round indexes, outer minutes/seconds track. Luminous steel skeleton hands. Cal. 1030, rhodium-plated, 25 jewels, straight-line lever escapement, monometallic balance adjusted to temperatures and 5 positions, shock absorber, self-compensating Breguet balance spring.