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Caliber: Tudor Manufacture Calibre MT5602Functions: Hours, minutes, secondsDiameter: 31.80mmPower Reserve: 70 hoursWinding: AutomaticFrequency: 4 Hz (28,800)Jewels: 25COSC Chronometer CertifiedAdditional Details: Includes link a link matte link black PVD-treated rotor

Here we see "Superlative Chronometer Officially Certified" text an indication that the movement inside is the microstella-regulated caliber 1565 automatic chronometer movement beating at 18000 vph. These four familiar words continue to be printed on Rolex watches to this day. One of the big differences between steel versions of the ref. 1675 and the link earlier ref. 6542 was the use of crown guards and in link these early link versions the crown guards are pointed resembling a parrot's beak.