Charles Boswell was a pigeon shooter. I had a nice 12 BLNE Boswell pigeon gun that I couldn't hit a thing with. When I patterned it, both barrels shot 18" above point of aim. 18" is about how far a pigeon could get up out of the trap. It took a good knowledge of how to choke /regulate the barrels for such a specific purpose. Someone may have requested it. After my patterning lesson, I just floated the clays high and enjoyed shooting it much more.
I'd say pattern it first, see if it has "pigeon chokes". I left my chokes alone and used it for trap. The next owner sent it to Briley to make it more flexible at Sporting Clays.
If your serial number is greated than 13000 (1898-99 or newer), Chris may have the gun's record in his ledgers.

Joe