134L1, Stringer & Morton's City Despatch, Baltimore, MD, 1850 1c Gold on Black, uncancelled single on folded cover to Burlington, New Jersey, large blue "Paid" handstamp at bottom edge and small manuscript "Paid" at top right, stamp with small corner crease at top right, otherwise very fine and fresh, Steve Roth recorded just 14 covers with the Stringer & Morton adhesive in his February 1997 census (Chronicle 173), 2022 Philatelic Foundation certificate (Scott $650) Provenance: John A. Klemann (H.R. Harmer, 1953)