That's a Japanese 10 yen. Made of bronze I think. Minted from 1951-1989 I think. I also reckon that it's worth about .25 cents. There are a couple minted in the 50s and early 60s that are worth a good premium, but I'm rusty on how to figure out the years.
Edit: I'm about 95% positive yours is a 1966
1. I'm no expert but I'll give my two cents.
2.My favorite coin so far: 1913 Buffalo nickel matte proof type II reverse