It is very similar to a Simson Modell 71 or 72 but with a cape setup instead of a double scattergun. Looks to be a Kerner-Anson variant. I'm not sure of their cape Modell Nrs. But with the menacing muzzle, I'm quite confident it was an inland client. One of the last prior to the acquisition of Simson.

Kind Regards,

Raimey
rse