Hard to tell if it's a patent number (I don't have it in my database) or patent use number. I'll put up pictures of the gun and the advertisement. Perhaps someone might recognize something (note Henry A&T patent use numbers on the barrel) (also you rarely see a straight stock on a Reilly SxS rifle):
https://www.gunsinternational.com/guns-f...un_id=100569861E. M. Reilly .450 BPE Double Rifle
Description:
Magnificent .450 BPE for either black powder or nitro-for-black loads. 25.5 inch barrels, and a handy 37.5 inch overall length. Rebounding firing pins, lever forend latch, fine and clean checkering. Possibly refinished, but if so, exceedingly well done. Fully engraved everywhere. Unusual "side-under lever", opens by pushing down as opposed to pulling to side as on most underlevers. Opens and closes easier than any I have felt. Very, very smooth like a bank vault. Very fine bores with deep rifling. Crisp trigger pulls. Straight English style stock. Only 8 pounds, points very well. Locks up tight. Sling swivels. Stock has high end shotgun style butt that has toe and heel plates. Comes in period correct English leather and oak case restored by Marvin Huey with onyx tools, brass oil bottle, brass cleaning rod. Comes with reloading dies and around 40 loaded rounds, some period rounds, some current Kynoch. Also comes with unloaded brass, around 300 projectiles, and trim die. Email for more photos,
