This $50 pesos Coyolxauhqui coin from Mexico has an interesting feature - an error known as doubling or remarcacion and die chip in different spots.
 Despite being circulated, this coin still retains its copper-nickel composition and was minted in 1982 with a KM number of 490. 
It is uncertified but has not been modified in any way. 
This coin is a great addition to any coin collection, especially for those interested in errors.
See pictures.

Esta moneda de $50 Pesis Coyolxauhqui de Mexico tiene errores de remarcacion y die chip, ver las fotos.
Escelente adicion a su coleccion o como relgalo a su coleccionista preferido.