They are from the "æ˜å’Œ" "showa period" . The "showa" period is from 1926-1989 but these are at least 30 years old as Japanese stopped using them once the word processor was invented.
This would be perfect for using as a stamp with ink or for stamping clay etc.
This stamp is the Kanji (Chinese character) for "慾" "yoku, konomu, musaboru" = "lust, desire, passion, appetite".
It measures 2.3 cm long (long enough to be able to get a nice grip) and 5mm wide. The Chinese character itself is about 5mm wide....so please note how tiny it is. It is made of metal.