Watch List notes:

Mexico City, Mexico, cob 4 reales, Philip IV, assayer D. S-M18a; KM-38. 12.98 grams. Broad flan, uncorroded and attractively toned, with full shield and cross and oMD, some flat areas as usual. Pedigreed to the David Horner collection. Recovered from: "Jupiter wreck" (San Miguel el Arcangel), sunk in 1659 off the east coast of Florida ($125-200)