Hill's Post, Boston, Massachusetts, 1c black on rose, large margins all around, affixed to folded letter, postmarked "Boston 10 Cts / 18 / Oct" c.d.s., to Cincinnati, Ohio, some adhesion remnants to reverse, a rare franking, with only seven covers recorded, all but one of which have the adhesive untied, and one of which is also addressed to Ohio and postmarked on the same date as the example offered here; with clear 2023 Philatelic Foundation certificate.