Great Britain 1840 1d black, plate 1a, SG2Widely considered to be the finest quality single Penny Black first day cover in existence. Great Britain 1840 1d black, plate 1a, SG2 The "Sandeman Port" penny black first day cover. May 6th, 1840, the first day of issue, "Sandeman Port" letter and invoice from Sandeman, Forster & Co. sent from Lombard Street to Norwich bearing a 1d black plate 1a lettered "QJ", tied by a complete Maltese Cross cancellation and with Lombard Street Maltese Cross type