Watch List notes:

Mexico City, Mexico, cob 8 reales "biscuit" (completely cocooned in thick oxidation with shells), probably Philip V, assayer not visible. 32.36 grams total. Hefty and thick rectangular chunk of black oxidation (following the contour of the coin itself) with lots of tiny white shell-bits, a neat display that could contain a choice coin (based on weight). With certificate.Recovered from: Vliegenthart, sunk in 1735 off Zeeland, Netherlands.

Estimate: $250 - $375