I found this in an antiques shop, in Kiel. The shop owner did not know what it was, but I bought it for allmost nothing. After a little investigating, I found out that it is a id tag for a soldier of 3 kompanie, 2 marine infanterie regiment.
I hope you like it.

All the best
Stig Erik

Click image for larger version. 

Name:	Id%20brikke,%202%20Marine%20Infanterie%20Regiment.JPG 
Views:	54 
Size:	72.0 KB 
ID:	399604