The caliber 6630 is according to the Flume Werksucher the final 6 3/4 ligne movement, which was relased from Langendorf (Lanco) about the end of the 1960ies. Unlike the form movements, which were state of the art at that time, this movement is a round shaped one, but doesn’t use all the space, it offers.
It’s based as you can easily see, on the Langendorf 600.
|Number of jewels:||17|
Nickel anular balance|
|Balance bearing / direction hairspring:||Counterclockwise|
|Adjust mechanism:||Hairspring key|
Flume: K3 -|