Good point Daryl. Scroll down to the bottom of both these albums for pics of 'WR', 'BD', 'EH', and a bunch of marks on steel barrels, including the as yet unkown 'W&R'



The 'WR' is an assumption on my part, which we may be able to confirm now that Dr Jim has the Hunter Arms records
http://www.picturetrail.com/sfx/album/view/17116222
http://www.picturetrail.com/sfx/album/view/19686599

Northup87 is correct that the ?5 letters to the left of the 'WR' are my question, and a mark not previously identified on Smith barrels.