Blunderbuss ID Needed

[trenchwarfare]

Am resurrecting this thread, as new info has come to light. I found these images of a barrel for a matchlock, rampart/wall gun. It clearly has markings identical to the ones on my blunderbuss. This barrel is apparently very old. My theory is, the weapons stored in the Jaipur Arsenal, were inventoried, cataloged, and marked, before disposition. This was done, well into the 20th century. That would explain the modern fonts used.