Joseph Lesher minted octagonal silver coins that are now worth a pretty penny.

(Courtesy of Christopher Marchase)

The price of silver was flagging in the early 1900s. To boost it, a silver miner named Joseph Lesher decided to mint silver coins. The octagonal currency was a hit, but investigators at the Secret Service were wary.

The story is told in the new book "Forgotten Colorado Silver: Joseph Lesher's Defiant Coins." Co-author Kenneth L. Hallenbeck, a former curator of the Money Museum in Colorado Springs, speaks with Colorado Matters host Ryan Warner.