I think R.E. Davis used to assemble Siler locks for sale, so it could be a “Davis/Siler” lock. I believe most of the Davis locks were made from castings obtained from the Mould & Gun Shop, but I seem to recall some Silers in the R.E. Davis product line years ago, also.I think Mr. Davis wanted to assemble the locks to his own standards, which were pretty high. There were other people assembling locks from Siler parts sets who were not doing such a good job… one in particular comes to mind… but the locks by Davis were well regarded.