MEXICO. 4 Reales, 1847-GC MP. Guadalupe y Calvo Mint. NGC FINE-15.KM-375.3. Evenly worn with few marks and coppery gray toning throughout. The last example of this date that weve seen offered at auction, very comparable but probably just a touch finer than this piece, was sold by us as a Fine in March 2011 where it brought $1,700 hammer.Ex: Richard Ponterio Collection.