I got to see and handle a couple of these a few years ago. One by Boyer, the other with the barrel marked "A. Angstadt" (I believe the same one that has been pictured on this board...).
Both were nicely shaped, though somewhat "oversized", particularly the Boyer gun. The surfaces were definitely rough...comparatively speaking. Both had varnish on them and some kind of stain, looked like ordinary pigment stain, but I can imagine that they left the shop with nothing at all on them as to stain or finish.
The butt ends were rough and beat up, naturally, but really none the worse for wear, considering.