LONGINES rare 18k yellow gold chronometer wristwatch Ultra-Chron, self winding, Switzerland end 1960´s, reference 8356-4, neutral 18k yellow gold bracelet, screwed down case back, gold-plated dial with raised hour-indexes, display of hours, minutes, sweep seconds & date, high-frequency oscillator, calibre 431, central rotor, glucydur-balance, flat hairspring, Kif-shock-absorber, excentric precision adjustment, measures approx. 40 x 37 mm, length approx. 17 cm, condition 1-2, total weight approx. 96g