Boyd's City Express, New York, 2c black on green, glazed surface paper, serrated perforations, affixed to folded letter, internally dated May 6, 1846, cancelled with black handstamp, red 'PAID" below and oval "Boyd's City / Express Post" (6 May) adjacent, some light toning, yet a rare example of this privately prepared perforated stamp; with 2023 Philatelic Foundation certificate.