Bill Large barrel stamp

[jimdvan]

I traded a friend for the flintlock rifle that has this barrel. .54 caliber, the barrel is maker marked W.M. Large in an arc, then J.J.J.J. below, then "L" under the J's. The mark is on the next flat to the left of the bottom flat. "L. Price" engraved on top flat.

Does the L indicate a refreshed barrel? Any idea of the vintage? I'm thinking 1970's.