cover -- 1d. red-brown, plate 100, AJ and BH-BI pair used together on envelope dated 22 May 1851 from London to Warwick, tied by London numeral cancellations; a few small perf. faults and the envelope with small central tone (from wax seal) and filing note on front at left, otherwise fine and a rare multiple franking of this issue. B.P.A. Certificate (1948). S.G. 16b