The caliber series 72xx was produced in the 1970ies and produced in many different versions, even one with a high-beat (36000 A/h) chronometer.
The caliber 7290 is a low-beat movement with only 21600A/h. It uses a bidirectional selfwinding mechanism and contains a hacking feature. The date can be corrected in the first crown position, the weekday needs turning the hands between 18:00 and midnight.
|Number of jewels:||23|
Glucydur anular balance|
Parashock 1 (Citizen)|
|Balance bearing / direction hairspring:||Clockwise|
|Adjust mechanism:||Hairspring key|
|Functions:||hour, minute, second, day, week day|