1787 Potosi 8R Regal Or CCC?

Someone else bought a coin through an on-line auction (shame on me, never again). It weighs 26.78 grams, it is 42.2 mm diameter and 2.2 mm thick. See photos. My question is whether anyone has seen period counterfeits (that is, coins struck back in the late 1700s or early 1800s to pass as genuine) or if it is more likely to be a current fake coin. The Obverse has a clear double strike on the effigy. Edge looks good. Not my coin so person is viewing if edge has 180* overlaps. Potosi can be tough. Hopefully someone has seen this before and can shed some light.



CCC vs Regal: Key Considerations
Double-struck effigy: This is a hallmark of CCC production, especially when the doubling is bold and misaligned. Regal mints had tighter die control.

Edge impression: While the edge appears well-executed, the lack of 180° overlap is a strike against regal origin. CCCs often replicate edge tooling but not rotational precision.

Dimensions: The slightly oversized diameter and slightly light weight are consistent with CCCs, especially those struck on locally sourced planchets.

Potosí mint: This mint is notorious for high-quality CCCs, especially from the late 18th century. Many were struck to circulate alongside regal issues and are extremely convincing.