Re: Need help to identify old german 12 gauge shotgun
In Germany at that time, many guns were made by a consortium or guild of makers and since it was a cooperative, there was no single maker who could put his name on the gun. The name on those guns was usually not the maker, but the retailer, who bought the gun plain and had his name stamped or engraved on it.
If the law specifically states that the "maker" must be named, then you can't name a maker. But if the purpose is to identify the gun, the name on the gun should be adequate to do that, even if he is not technically the maker. My feeling would be just to list Illix Aind as the maker and not go into such details with the authorities.