This is a Tamasando one-touch abacus. My child used it when they were in elementary school. They quit quickly because they didn't like it, so it hasn't been used much, but it has been stored for a long time, so the inside of the case is a little black (photo 8). The name is written on the paper of the case, so I will cut it out and send it (photo 7). There is also an engraving of the maker (photo 5). Please understand that this is stored at home before purchasing.