Watch List notes:

Mexico City, Mexico, cob 1 real, Philip III, assayer D, Grade 2, rare. S-M18. 1.63 grams. Small round flan with edges corroded away, centers of shield and cross clear, right side of oMD visible, toned, highly desirable denomination for competing sets. With original Fisher tag and certificate 85A-228972. From: Atocha, sunk in 1622 west of Key West, Florida
($500-750)