Watch List notes:

COSTA RICA. Colon, 1923. San Jose Mint. PCGS AU-58; Countermark: AU Details.
KM-164. Counterstamp placed upon a 1902-CY Costa Rica 50 Centimos. Hardly handled, this tremendous minor features a great deal of remaining brilliance as well as an alluring iridescent tone as one approaches the peripheries.

The early portion of the 20th century was difficult for many Latin American countries and Costa Rica was not immune to the pain. Faced with a loss of currency purchasing power and an economy that struggled as a result, they, like other surrounding countries, felt compelled to make dramatic financial changes. For Costa Rica, part of this change included issuing debased silver coinage at .500 fine and striking minor denominations in brass. The decree of 1923 extended these efforts, calling for all circulating silver coinage to be revalued at twice their face value, the 25 Centimos being overstamped 50 Centimos and the 50 Centimos becoming a Colon.

Estimate: $100 - $200