61L3, Eagle City Post, Philadelphia, PA, 1850 (1c) Red on Bluish, uncancelled single on cover to Burlington, New Jersey, with W. Stait label on yellow at lower left, blue "Philadelphia Jun 11 5cts" integral rate datestamp, very fine and fresh, a rare and attractive genuine use of this stamp on cover, 2022 Philatelic Foundation certificate (Scott $1,750)