Konnichiwa RHUSMC-san!
I think it's hard to tell if it's real or fake.
The coin is a "五銭:5-sen" coin maybe, minted between 1938 and 1940. But the photo is small and I'm not sure
Even if the coin is real, it doesn't mean this belt is real. Because this coin is still available on Amazon for cheap and easy purchase.
sell site : Amazon
NANGI