Longines “Ultra-Quartz”

Swiss Watch Fair 1970 BF 413
Here is the cybernetic quartz watch Longines ’ own systems. Its movement incorporates two oscillating circuits, each governing the other by means of a comparator circuit. Annual variation is less than one minute Battery life 18 months A i ’ 000-unit series, presently being manufactured, will be put on the market at the beginning of 1971. (LONGINES “Ultra-Quartz”)