Rolex, Oyster Perpetual "Datejust TURN-O-GRAPH", so-called "Thunderbird", Superlative Chronometer, Officially Certified. Ref. 1625. Produced in the early 1960's.Fine, center-seconds, self-winding, water-resistant, stainless steel and 14K yellow gold gentleman'swristwatch with a stainless steel and gold Rolex Oyster bracelet. three-body, polished and brushed, screwed-down case back and crown, revolving reeded and graduated gold bezel, crystal with "Cyclops" lens. satiné silver with applied yellow gold indexes and tritium-coated dots, aperture for the date. "Bâton" tritium-coated yellow gold hands. Cal. 1560, rhodium-plated, "oeil-de-perdrix" decoration, 25 jewels, straight line lever escapement, monometallic balance adjusted to temperatures and 5 positions, shock-absorber, self-compensating free-sprung Breget balance-spring, Microstella regulating screws.Dial, case and movement signed.Diam. 36 mm.