We were lucky to come across a case of these "katsuji" (Japanese typewriter "keys"). There are over 2300 of these. They are vintage but have never been used. These would have been the extras in case the ones in the machine broke. Please look at the last picture to see what an old Japanese typewriter looked like. There were at least 2000 keys so needless to say, this was only used in businesses.
They are from the "昭和" "showa period" . The "showa" period is from 1926-1989 but these are at least