I agree it is a Class 3 numismatic forgery. There appears to be part of a raised seam line visible on the second photo. Sorry but at least it is a nice looking copy.
Here's a typically bad (double struck) but genuine Potosi cob from the same period to compare with.
Two notable differences
-The detail on the figuring and lettering is much sharper edged. This is characteristic of struck coins. The soft-detailed coin you found looks like a casting. I used to have a similar one made for a souvenir key fob.
-The level of detail on Potosi cobs was extremely poor, and got worse as time went on. A coin with as much detail as the one you found would be an extreme rarity.
"Two minutes ago I would have sold my chances for a tired dime." Fred Astaire
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