Description:- The Alexandria "Blue Boy" is a very rare stamp. It takes its name from the feature that makes it unique: its color. One of the few surviving stamps from a rare issue—the Postmaster's Provisionals produced in Alexandria, D.C., beginning in 1846, only seven of which are known—the Blue Boy is the sole example printed on blue paper (the others are on buff-colored paper). Postally used, the Blue Boy remains affixed to its original envelope, which last sold in 2019 and still holds the record for the highest priced cover of United States philately.

Source: en.wikipedia.org/wiki/Alexandria_%22Blue_Boy%22_Postmaster%27s_Provisional

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