I have a bunch of those padlocks with a quite unique mechanism.
They were probably made by Guri even though the padlocks have no marking at all.
(I have a Guri padlock with the same mechanism).
As far as I know they are not produced anymore but they where quite common in the GDR.
Because I got a bunch I thought it might be a good idea to open one to see how the mechanism works.
Here is the result:






