Watch List notes:

Mexico City, Mexico, cob 8 reales, (16)28/7D, rare. S-M18a; KM-unl (type 45). 25.16 grams. Bottom half of date visible (the overdate bold), full oMD, full shield and cross but peripheries crude (with light corrosion near edge), somewhat mushroom-shaped flan. Recovered from: "Spice Islands wreck," sunk ca. 1629 off Southeast Asia (Estimate: $300 - 450)