The Pony Express operated in the United States from April 1860 until October 1861. They decreased the shipping time for mail across the US from months aboard a ship or a 25-day stagecoach ride to an average of just 10 days. This was accomplished by setting up relief camps across the frontier that lone horsemen would ride between and relay mail across what is now Missouri, Kansas, Nebraska, Colorado, Wyoming, Utah, Nevada and California. Although it brought a significant decrease in delivery time, it was unsustainable financially and unavailable to the general public due to its high costs. Along the route, riders switched horses and transferred mail between each other across 190 relief stations. Although expensive and unsustainable, the Pony Express was rendered obsolete when the transcontinental telegraph was completed less than 2 years from its inception.

The obverse of this 32 ounce bar illustrates a cowboy riding a station, making a direct reference to the original Pony Express. Accompanying this image is the metal weight and purity of the bar. The reverse features a blank surface with natural striations and texture lines from the cooling process present on both sides.