The Pony Express Association is evidently still active to this day, having annual "re-runs" by volunteer riders to re-enact the actual ride of the Pony Express that lasted 18 months between April 1860 and October 1861.
The completion of telegraph lines ended the historical feat of carrying the mail from Missouri to California in only 10 days by horse and rider.

The National Pony Express Centennial Association was chartered in 1957 in Utah as a non-profit corporation, with it's only purpose, to sponsor a 1960 re-run and to perpetuate the history of the Pony Express.
The Board of Governors were from California, Colorado, Kansas, Missouri, Nebraska, Nevada, Utah and Wyoming, the eight states through which Express ran.
President Dwight D Eisenhower agreed to be the Honorary Chairman of this Board in 1957.

The 1960 re-run was financed principally by the sale of 1,000 letters carried by re-run riders, Official First Day Covers and U.S. Mint Medals.
Official Medals such as my silver one above were authorized by Congress as "national medals". There were far more bronze medals minted, perhaps 50,000 to 100,000 bronze were struck of the half million authorized. Only 5,000 silver were struck.

It was designed by J. A. Links and struck at The Philadelphia Mint.
The obverse shows the Pony Express founders with conjoined busts of William Hepburn Russell, Alexander Majors, and William Bradford Waddell. The reverse portrays the famous watercolor by Herman Hansen, Pony Express Horse and Rider that he painted in 1900.