I think this coin is very interesting and a well made copy of a very rare Nueva Senora la Reina de Santa Fe de Bogota, Buenaventura de Arce eight reales. Some odd things: The genuine coin shows "ARC" short for Arce, while this coin has the assayers initials backwards (CRA). The genuine coin repeats the date in the legend while this example does not. Lions and Castles are inverted to Castles and Lions which can happen on regal coins. Lastly the crown on the obverse is quite ornate, unlike the genuine 1721 coin. If this were real it would be both rare and expensive. Much of the rest of the design does imitate the genuine piece of eight pretty well. I get the sense this was a museum copy and somewhat modern, but much more than the run-of-the-mill pirate coin copy. It would have buyers among advanced collectors "Black Cabinet" of counterfeits. If it were a bit cruder and did not have so many obvious red flags, it would be more convincing, and whoever made it had the skill to do so, but refrained from making it really tricky. As I said, "very interesting."