I'm trying to develop a list of 1870-1915 importers and sellers of European shotguns, British, Belgian, and German primarily.   I'm trying to focus on mid to higher grade guns, not your lower "Hardware Store" field grade types.  If anyone has any input or can provide a reference I'd very much appreciate it.
I'll start with a few listings, I'm sure woefully lacking scope of inventory.  I'm especially curious to know the sellers of the mid to higher grades of English shotguns.  I realize that many will be "sellers" rather than the actual "makers", but that is fine, but reference to actual makers (if possible) would be great.
DS&G:  Prussian guns, hammer and hammerless, marketed under the "Charles Daly" name.
VL&D (later A&F):  German and Belgian guns, Sauer 1900 hammerless sidelock (model 1900) and later a Francotte boxlock, marketed under the "Knockabout" name.
Regards
Ken