Rolex. A fine and rare stainless steel chronograph wristwatch with black dial Signed Rolex, Cosmograph, Daytona, Ref. 6239, Case No. 2’548’182, Circa 1970 Movement: cal. 722-1, manual, 17 jewels, signed Dial: black with tri-color Rolex Cosmograph Daytona script, signed Case: screw back, inside case back stamped 6239, 36 mm. diam., signed With: Rolex fitted presentation and service division box