Posted the associated smooth rifle a couple of years back. Gun and lock are unmarked except for the cartouche on the inside of the lockplate. I have a added a couple of photos to this post hoping I can get some direction as to origin of the lock. Anybody out there who has seen such a cartouche?
Cartouche appears to be "IR". I assume that the "I" could be a "J".
Since to percussion conversion was bugging me, I re-converted. Please don't be offended.
I'll post an after picture and some pix of the rifle later. Here is a link to a series of photos of the smoothrifle:
http://www.neconos.com/detailssmooth.htm You may have to copy and paste.