Hello and welcome to Numista,
Here it is in the catalogue, for reference. It's the "large 3" variety.
At first sight, it looks authentic, but there are others on this site who are experts in early American silver and they might know better.
I suppose you're aware this coin is worth well above US $1000? If the price seems too good to be true, that could be an indication it's a fake. You may want to check the seller's other items as well and whether he has good reviews.
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