When were ten yen coins made?
Could you elaborate on the historical timeline of the creation and issuance of ten yen coins? Specifically, I'm interested in understanding when these coins were first minted and introduced into circulation. Was there a significant event or reason behind their introduction? Did they undergo any design changes over the years? I'm also curious to know if there are any plans for future modifications or discontinuation of the ten yen coin. Any insights you could provide on this topic would be greatly appreciated.