Yeah, and (pure) nickel coins are magnetic.
Also, if it might tickle your fancy, Showa 42 (1967) was also the first year that the 100 yen coin was minted. But, the 100 yen planchet is 22.6mm, while the 10 yen one is 23.5mm. The borders on yours seem to be the regular thickness.
Also, if it might tickle your fancy, Showa 42 (1967) was also the first year that the 100 yen coin was minted. But, the 100 yen planchet is 22.6mm, while the 10 yen one is 23.5mm. The borders on yours seem to be the regular thickness.





















