Polerouter S20217/5 — Silver Crosshair Shield Dial

Universal Genève 138SS

AutomaticAutomaticA mechanical movement wound by a rotor as the watch moves on the wrist. bumper movementBumper automaticAn automatic winding system whose pivoting weight travels through a limited arc, meeting spring buffers at the ends of its swing. Wrist motion moves the weight to wind the mainspring. Unlike a full-rotation rotor, the weight cannot turn continuously through 360 degrees; the travel angle varies by design. with central secondsCentre secondsA seconds hand mounted on the same axis as the hour and minute hands.. The collector calibre table lists 17 and 18,000 vibrations per hour. Its winding weight has limited travel; it is distinct from the later calibres.