U-boat badge unmarked

[willcpfc]

Can I have evaluation on this badge please.
There are no maker marks. Hand finishing marks on the edges and a few small bits of olivegolive paint on the inner recesses. It's not been cleaned. I hope it is an original.

[willcpfc]

Hinge and pin - unfortunately the catch is closed.

[Don D.]

The details are very soft and there are quite a few casting bubbles.