Just picked this up from USDS a few minutes ago. It's a Stevens Model 87D (gill gun or "click-clack" rifle). It was made in 1959, the same year that I was made. They said they took it out and fired it and it functioned as it should, so I'm going to refinish the stock, take it apart and clean and lube it and it should make a nice little squirrel gun for the grandson (11). Here are the before pics: