As I am new at collecting these old double barrels, I cannot totally answer your question. I have never heard of Roger Arms co. HOWEVER.. there were SO many of these shotgun companies popping up at the turn of the century that this doesn't surprise me.
Here's a website that might help you.
http://www.briley.com/articles/grampas_shotgun.html
there's a lot of info on this site...may not totally cover your gun.. but it might come close.
hope this helps!