Pictures Of 8 Reales Counterfeit Edge Details

Swampbob and Archraz, thanks for both replies.
I collect Bank of England $/5s. A subset of my collection is copies with clear date show-through from the original 8 Reales. I then match these as pairs with Spanish or Spanish Colonial 8 Reales of the same date. I have BoE$/5s with clear show through from 1772 to 1810.(Charles III, Charles IV and Ferdinand VII. From Seville, Madrid, Mexico and Potosi.
That preamble is to help explain my next step. We have today made precision density measurements on two BoE$/5s. One with Seville 1779 show through and the other Madrid or Seville (1779 or 1772).
The densities are 10.26grms/cc^3 and 10.34grms/cc^3.
An Ag/Cu alloy would be 10.32.
I now await the "authentic" coin money back decision of the reputable house that this was purchased from!!

Swamperbob. At the time of writing the last sentence of my last post was a sort of cynical joke. But I can now say the reputable house has agreed on the evidence presented that they have made a mistake and have agreed to return my money.
Yes I agree, the densities of the two genuine 8 Reales (10.26 grms/cc and 10.34grms/cc) are within tolerance. They provide the overwhelming evidence that the coin in question at 9.38grms/cc is fake.
It is a strong indicator that the "fake" coin is made from a an alloy with a weight fraction of 70 copper 30 silver. (Density of that alloy is 9.32grms/cc)
From contact with other collectors I am told that relatively recently a newspaper in Madrid produced a medallion copy of an 8 Reales as a give away. Maybe it is a modified version (edge added) of one of those. Anybody know anything about that?