Not Japanese. In the slight chance it helps, it says that it's dated "year 15" assuming that it's read from right to left and that the "year" character goes at the end like a Japanese coin. If I'm wrong about that, then it's "year 50". Other than that, I can't read anything.
Actually, it's Chinese. Regarding the left image, the inscription at the top reads (right to left) zhong hua min guo shi wu nian which translates as "Republic of China year 15". "Year 15" of the Republic would date the coin as 1926. The inscription in the middle of the coin is written vertically (top to bottom) as yi jiao which means "one jiao" ("10 cents"). The bottom inscription is written right to left as mei shi mei dang yi yuan which translates as "each 10 coins is the equivalent of one yuan". A yuan was the Chinese equivalent to the "dollar". I do not have any reference books on these coins so I can only provide the translation. Other forum members may be able to attest to authenticity and current worth. Gary
