Watch List notes:

Mexico City, Mexico, cob 4 reales, Philip III, assayer oF below mintmark M to left (MoF), very rare.S-M13 (under Ph. II); KM-36 (under Ph. II); Cal-746.8.61 grams.VF details with corroded surfaces from unspecified salvage, rare type with clear assayer oF, some shield and cross detail plus clear denomination.From: Shield Type
($150-225)