MEXICO: Carlos IV, 1788-1808, BI 8 reales, 1798, assayer TM, contemporary debased imitation, lightly scratched, Fine. Struck imitation, once silvered, billon or base metal core, with a disticntly odd 7 in the date. Probably produced in the early 1800s and this type does not appear to be in Bob Gurney's book.
Estimate: 100-150 USD