Original Unmarked Allgemeines Sturmabzeichen ?

[Jc9765]

I need some help authenticating this Allgemeines Sturmabzeichen.
I believe it is an original piece made from zinc.
It seems that the catch was repaired/replaced.
I have no idea who the maker was because it is unmarked, I'm not a medals expert so I don't know much about all the little fine details and differences.

Any help is appreciated, thank you.

[ryuuk]

Оriginal unknown maker badge with replacement catch and pin.