Went to the store and got this in my change was wondering what it was, if you know please let me know. Thank you.
This link will help you nail down the date. China 100 Yen https://en.numista.com/catalogue/pieces1589.html
Ah yeah. I spent many of those on various things such as hot coffees out of the machine, yakitori down at the local yakitori stand. Etc. etc. etc. Can't believe it's been roughly 31 years since the Showa era ended.