Population of only 3 coins>Mexico produced this bullion coin as part of their Pre-Columbian Azteca series. This 5 Peso (1 Onza) - 1 Troy Ounce coin shows a carved effigy (Brasero Efigie) on the reverse, with the national arms on the obverse.
With a Proof mintage of ONLY 4000 this is a hard to find coin! Get yours now while it lasts! Listed in Krause as KM#563.