[Leavenworth City & Pike’s Peak Express, earliest known westbound letter], 5 April 1859 cover from Stouts, Ohio to Cherry Creek, Kansas Territory (now Denver), manuscript origin postmark and 3c stamp, endorsed by sender to be carried "by way of Fort Larimie" but sent on the third westbound trip of the LPPE The Leavenworth City & Pike’s Peak Express (LPPE) began operations from Leavenworth on April 18, 1859 and from Denver on May 10. It operated under that name for three months. Westbound mail bore no year date while eastbound included the 1859 year date.

(MWE Figure 12-6), ex Haas, Jarrett, Risvold and Walske (Image)