Welcome Pat. I'll repost Diggory Hadoke's chart on London and Birmingham proof marks (your gun) which might help - it looks like it has Birmingham proof marks from 1855-1868 - defer to other opinions; and the 13 and 14 on the barrels might be the bore -take a picture of the barrel flats:

[Linked Image from jpgbox.com]

Last edited by Argo44; 03/22/21 09:54 PM.

Baluch are not Brahui, Brahui are Baluch