I have a Soddy Daisy rifle with the stamp, also. The stamp is very worn, no name on the rifle, and the barrel is very worn. Patch box, trigger guard, and architecture look like the Clement rifle on page 52, Volume 3 of Jerry Noble's book. The Soddy on page 54, Volume 3 may also have a stamp.
I think there may also be a stamp on the Enoch Hardin rifle page 113, Volume 2 of Noble's book.