Meech, can you post some clearer, straight on front and back shots in natural light please? I'm not liking the badge but I don't want to write it off without a better look.
There were five makers of this 2nd pattern badge, AS in triangle, Schwerin, Rudolf Souval, an Unknown Maker and B.H. Mayer. It doesn't resemble any of the first four but there is a passing similarity to the Mayer design although the trimming outline of the wreath isn't good.
Looking for LDO marked EK2s and items relating to U-406.....
I'm sorry to say that i am not liking this badge.It looks as though it is a poor quality cast that at one time was riveted to something.