I recently inherited a .410 ga. shotgun from Mississippi Valley Arms. Through a bit of research I've found it to be American (crescent). So, that puts it between 1900 and 1930, I believe. How would I go about nailing down the date. I'm hoping to have a plaque engraved for the display case I intend to keep it in. Any help here would be greatly appreciated. As far as value, the shotgun is in excellent shape with the bores looking almost new. I have heard from family members that it hasn't seen a whole box of shells in it's life. The wood is all original and there is very light pitting on barrel near breach. The rear sights are missing, but brass bead is intact. Breakover is smooth and tight with no side-to-side wiggle at all.