Help Identifying Shipwreck For Sea-Salved 1777 Potosi 8 Reales

I know little about sea-salvaged coins, but weren't most of the coins struck in the "new world"?

to the CCF

Almost impossible to tell what shipwreck, if it even was, that it came from.
Sometime after 1777.
Do you have any paperwork saying that it is a shipwreck coin? Without it ,
it would be hard to prove.

to CCF

Identifying a providence of that coin my prove to be very difficult without any paper work tracing it back. You my cave to talk to the folks you got it from, and work backwards from there and finally get a manifest or ships log that identifies it.

Good luck

Just to eliminate one possibility, are you sure it's genuine, where did you obtain it.

More than the the 7 is off, that's why I'm asking where he obtained it.

bayareacoin I would agree with most of the comments above. The first issue is always:

Is the coin genuine? Specific gravity might be slightly on the high side since copper erodes more easily than silver in particular for shipwreck coins. An XRF test might also be helpful. In this case any gold trace will be very very small compared to Mexico but Arsenic and cadmium are far more likely to appear in measurable amounts. Anything resembling a pure alloy of copper and silver alone could point to a modern forgery. Traces of iridium or heavy earth elements used to improve electrical conductivity should NOT be found in a Bolivian silver coin. I would definitely assess any XRF tests with great caution and someone very familiar with false positives should interpret the raw data.

I have far less familiarity with XRF testing of Bolivian coins that I do with Mexican issues. However, the mine at Potosi in 1777 did very little to remove most trace elements that were not very easily oxidized by heating the metal to a liquid state.

Regarding the shipwreck, I would NEVER accept an attribution to a specific shipwreck without formal recovery data. A guess is easy to make but impossible to prove.