Another fake - but a good one. There are large numbers of these kinds of fakes appearing and the only good way to tell is to look at the other stock the seller has. In this case, the seller has a hundred other suspiciously high quality rare coins listed; not too long ago, they were listing obvious fakes, but they seem to have just passed off a set of these high quality casts - I suspect it is all one person with multiple fakes of each coin, creating a new eBay account each time they list a set.
For the avoidance of doubt, another account has also listed a big group of these fakes recently - heres an exact match for your coin in that group:
That seller is still active and has the same product history as the seller of yours - fake roman coins and saxophone mouthpieces.
Edit: Seems the seller accepts refunds on return, but you should try to prevent them getting the item back. At least you know you wont be too much out of pocket.
Edited by Ben
09/22/2019 03:18 am