cover 1868 (14 Jan.) entire to Mexico, bearing 1867-80 1/- plate 4 tied by London numeral cancellation, showing Calais transit c.d.s., red "PP" in oval and black handstruck "4" adjacent, inscribed "per French Packet" in manuscript at top, "LIGNE-B/PAQ.FR. NO.1" c.d.s. on reverse; light fold crosses adhesive