The Felsa 90 described here is one of the latest cylinder movements of a ladies’ watch and was probably made in the 1940ies or even 1950ies. Its measured size is 19.6 x 12.6 x 4mm (= 8 3/4 x 5 1/2 lignes, although it was listed in the Flume K1 with 5 1/4 lignes) and it contains 10 jewels.
As you can see on the details, this movement was a bit reworked during the production time frame.
|Number of jewels:||10|
Nickel anular balance|
|Balance bearing / direction hairspring:||Counterclockwise|
|Adjust mechanism:||Long regulator arm|
|Winding mechanism:||rocking bar winding system|
|Setting lever spring:||3 hole(s)|
|Size:||5 1/4''' (measured: 19,6 x 12,6mm)|
Flume: 1947 46|