Watch List notes:

Guadalupe y Calvo, Mexico, 1 escudo, 1846/4MP, very rare, unlisted overdate. KM-379.3. 3.29 grams. Lightly polished XF+, bold strike except for eagle's breast, clear overdate that is unlisted anywhere to our knowledge. On page 151 of Richard Long's comprehensive book on Mexican Republic gold (2004), the 1E 1846 GC MP is described as "so extremely rare that we have recorded just one private sale and no public sales," with the additional comment that "no overdates are noted." The present coin may be the "XF-AU ex jewelry" specimen listed by Long as having sold privately in 1986 for $500. (Estimate: $500 - 1000)