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This vintage hand-wound chronograph runs on caliber 727, a 17-jewel movement with 48 hours of power reserve. It has a 37mm case in stainless steel, a steel bezel with a tachymeter, a screw-down crown, and a Plexiglas-protected white dial with Tritium-filled baton hands, applied baton hour markers and three black chronograph sub-dials. The sigma dial is signed with “T Swiss T” and “Rolex Oyster Cosmograph.” The watch is fitted with a solid steel 78350 bracelet with big links and a deployant clasp. This Rolex model was part of the earlier models released without “Daytona” printed on the dial.