Girard-Perregaux “Elcron”

Swiss Watch Fair 1970 - BF 410 and BF 411
One of the revelations of the 1970 Basle 171i0 The prototype of a quartz electronic watch. 8’192 cycles per second reduced tne pulse per second by integrated circuit frequency dividers (2). A stepping motor transmits the impulse to the hands Power source two 1 ,3 V0 batteries. Precision one minute per year. The movement’s extreme compactness is worthy of note. With calendar. (GIRARD-PERREGAUX “Elcron”)