143L2 - 1861 $4 green, Pony Express - Mystic Stamp Company

Buying and Selling U.S. and worldwide postage stamps for stamp collectors.

143L7 - 1862-64 10c Wells Fargo & Co. Local Stamp - Pony Express, brown - Mystic Stamp Company

894 - 1940 3c Pony Express 80th Anniversary - Mystic Stamp Company

US Stamps - All Other US Stamps - Page 44 - Mystic Stamp Company

Pony Express Vintage Postage Stamps — Little Postage House

Robert A. Siegel Auction Galleries, Inc. Sale - 937 Page 47

143L4 - 1861 $2 Green, Pony Express - Mystic Stamp Company

113 1869 Pony Express Stamp Brown 2 Cents Vintage Collectible

143L9 - 1862-64 25c Wells Fargo & Co. Local Stamp - Pony Express, red - Mystic Stamp Company

Part 8 of Erivan U.S., Confederate States collection in Jan. 17-18 H.R. Harmer sale

113 - 1869 2c Pony Express, brown - Mystic Stamp Company

1154 - 1960 4c Pony Express Centennial - Mystic Stamp Company

113 - 1869 2c Pony Express, brown - Mystic Stamp Company

5715-19c - 2022 First-Class Forever Stamp - Imperforate Pony Cars - Mystic Stamp Company