Rolex. A Fine Stainless Steel Chronograph Wristwatch with Brown-Colored Registers and BraceletSigned Rolex, Oyster Cosmograph, Ref. 6240, Case No. 1'269'528, Circa 1965Cal. 727 mechanical movement, 17 jewels, silvered brushed dial, applied baton numerals with luminous accents, luminous hands, outer fifths of a second divisions, three engine-turned brown-colored subsidiary dials for 12 hour and 30 minute registers and constant seconds, tonneau-shaped water-resistant-type case, black bezel calibrated for 200 units, two round screw down crowns in the band, screw down crown, screw back, stainless steel Rolex Jubilee bracelet and deployant clasp, case, dial, and movement signed37.5mm diam.