This coin looks genuine, but it is not possible to authenticate it from the photo.
Fakes (especially coins
cast from genuine coins) can look genuine in photos (and can even be hard to detect in hand).
Either know the coin or know the seller. If you do not know enough about the coin to be confident it is authentic and you do not know enough about the seller to know they are reputable and expert, then DO NOT BUY.
Maybe,
shop at
FORVM?