Hello everyone. Recently i have purchased this flare gun. In order to get it out of customs i need to get a license from the police. They want to know some specs of this pistol but i have not idea what is the year or model. The only things i know is the note of the seller. I’m pasting it as it was written:

”One side is marked only with "1001, the other side is marked with a bunch of stampings, there are 2 eagle stamps, a small crown looking stamp over a "U" an "s" inside a triangle, what looks like a makers mark "SUHL" underneath a person or statue, "22562", a very small triangle with some letters in it, and an "a" with small marks radiating around it.”
Does anyone know more about this gun or a website with information for German flare guns?
Thanks in advance.