Mexico City, Mexico, cob 4 reales, Philip III, assayer F (pre-dated period), NGC VF details / rev damage. S-M12a; KM-37.1; Cal-745. 13.63 grams. Very choice strike (on a broad, oblong flan) with clear king's ordinal III flanked by distinctive diamond-shaped stops, also with R/G in GRATIA and INDIARVN with N (very rare variety, but none of this noted by NGC), bold full oMF and denomination 4, good full shield and cross, lightly toned, old punchmark near bottom of cross.
Estimate: 400 - 600 USD