This is a very simple, tiny ladies’ watch movement, which contains no jewels except the one of the finger of the balance, which runs in two plastic bearings.
A better version was released as caliber 5131.
|Size:||6 3/4 x 8'''|
|Number of jewels:||1/17|
Nickel anular balance|
|Balance bearing / direction hairspring:||Counterclockwise|
|Adjust mechanism:||Hairspring key|