Zenith XL Tronic Calibre 51.0
Dates from the 70s with tuning fork movement.
Funky square cased design with Zenith signed bracelet
(ESA 9181), ca 1973-1974. Features quickset day The ESA 9181 was ETA:s first quartz movement. Quartz @ 32.768 Hz controlling a stepper motor. Seven jewels.
The watch is available for sale / swap / trade. Please contact me for further details