Movado Massive & Rare 18k Gold Astronic HS 360 Chronograph "El Primero" 3019 PHF, circa 1970 Case: 18k yellow gold, three body, screw back with Zenith logo, 45 mm x 39 mm, polished and brushed, round buttons Dial: golden, gold and black markers and batons, red sweep, day, month and date apertures, thirty minute, twelve hour and constant seconds subsidiary dials, moon phase, inclined tachometer ring Movement: 3019 PHF, automatic, 17 jewels, bi-directional rotor on ball bearings, monometallic balance, straight line lever, shock absorber Band: massive 18k gold link, 7 5/8th inches, deployant clasp Signed: all elements signed Movado, gross weight is 214 grams Note: The caliber 3019 PHF is considered the rarest of the "El Primero" chronograph movements. The development of this sophisticated automatic chronograph with full calendar and moon phase functions was a joint venture by Movado and Zenith in 1970 (both brands were owned by the same holding company MZM between 1969 and 1983). It is estimated that production was limited to approximately 100 pieces. Examples in gold cases are exceptionally rare.