Tudor Ref. 7031.Tudor, OysterDate Chronograph, Ref. 7031/0, case.No. 756676, made by Rolex, Geneva in 1971..Fine and rare, water-resistant, stainless steel wristwatch with.date, round-button chronograph, register, tachometer and a.stainless steel Rolex Oy
C. Three-body, polished and brushed, screwed-down.engraved case back, crown and buttons, tachometer.graduation on the black bezel to 500 units per hour, Twinlock.winding crown protected by the crown guard, crystal with.cyclops lens..D. Bicolor anthracite and black with painted luminous indexes.outer 1/5th seconds scale with 5 minute/second red Arabic.markers, subsidiary dials for the seconds and the 45-minute.register, aperture for the date at 6. Luminous steel dauphine.hands..M. Cal. Valjoux 7734, rhodium-plated, 17 jewels, straight-line.lever escapement, monometallic balance, shock absorber.self-compensating flat balance spring..Dial, case and movement signed..Diam. 40 mm. Thickness 13 mm. Approx. overall length.175 mm.