used a variety of different postmarks on the mail it carried across the Western United States. There are only 250 known examples of surviving Pony Express mail/postmarks in various collections today bearing one of more than a dozen different types of postmarks.

Hawai'i Post, a discontinued personal delivery service, once had a surfboard mail postmark, for covers that traveled by surfboard.

A colour postmark is on the United States Postal Service-issued collectible

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