Ellenbr: to answer your question, there may be other proofmarks, the shotgun is
actually with my father in Wisconsin, I've got pictures of the barrels and watertable
but unfortunately the resolution just isn't high enough to read the proofmarks.

Jani,

Thank you for your kind words and input. I put a post on
http://boards.ancestry.com/topics.royalty.austrohungariannobility/427.1/mb.ashx
to see if that might turn up anything from the people who ancestry research, I will let you know if anything turns up.

Jim

I liked those pictures of your sidelock. I had never heard of this maker before
I got this shotgun but I am impressed with the double I own. I gather from the very
brief entries in "side-by-sides of the world for y2k" and the "Blue Book" that probably not many ended up in this country.

With kind regards

Fred