Are you sure of this jacket frei? I am not sure if i have ever heard of such stripes on the shield, or two under the shield. I have a photo somewhere of a Schuma w 4 stripes on the collar exactly like on your jacket
I know they used silverstripes on the arms. But i cannot remember seeing, or reading anything with this combination of insignia.
Now i am going to walk around like a zombie thinking of this jacket of yours frei. I bet my maids are going to ask me why i am on Google looking for related cossack photos instead for doing something constructive.