Such a coin should only be purchased through a very reputable dealer or auction house.
this sounds more like I saw a guy in the back alley who has near unlimited stock of this coin.
from the pictures though I cannot judge but it seems to be placed over a touristical treasure map.
If you like coins, medals and tokens with ship motives follow my new instagram account with regular updates @numisnautiker
From time to time I sell some coins on Ebay make sure to follow me @apuking on Ebay.