This appears to be a handmade prototype form one P. (or J. P.) Percy of Albany, NY, although I don’t have any information about who he was or when he built this. The gun itself is a .44/.45 caliber rimfire rifle, with three triggers. The first is actually a latch to release the tip-up barrel, and the other two and a sort of set trigger system. Inside, the whole trigger assembly is built as a removable unit, which is pretty interesting to see.