New Haven, Connecticut, 1845, 5c dull blue on white, with blue "E. Mitchell" signature, manuscript "Due –" with "5" handstamp in red alongside, postmarked with "New Haven Ct / Apr / 17" c.d.s., to Dr. Sowell in Athens, Alabama, in the hand of famed Yale chemist Benjamin Silliman Jr., small piece torn from back from removal of seal, cover has been professionally cleaned to remove staining, a fine-appearing example of this rare Postmasters’ Provisional, one of only a handful believed extant; Philatelic Foundation certificate no longer accompanies.