I found this in an antique shop. It appealed to me as I made a marble firing toy cannon for my son; we spent hundreds of hours firing cannon balls at wood block forts when he was growing up. This one is unique in that it has geared traverse and worm gear elevation. It appeals to me as a machinist. The maker is "B&B Mfg". It takes rounds up to 17mm in diameter. I am reducing the number of things in my office, so PM me if you desire it for your collection.