Potosi, Bolivia, cob 2 reales, Philip III, assayer M, Grade 1. S-P18; KM-8; Cal-628. 6.53 grams. Broad flan with full shield and cross (the latter slightly off-center), bold assayer M, silvery but no corrosion. With Fisher tag and photo-certificate 217280. From: Atocha, sunk in 1622 west of Key West, Florida
($750-1100)