These guns are often incorrectly called "guild" guns, but are really made "for the trade". By this I mean they were made for other handlers who could then add their own name onto the gun. Most all the makers did this and if it looks like a Sauer, it may be a Sauer. Oftentimes they didn't have a name added; especially if it went to a small shop, instead of a large one like Waffen Frankonia or Ed. Kettner.
Mike