Pl.6(CK)(SG26) ON COVER. 1855 envelope flap missing used locally in London bearing Die 2 pl. plate 6 L.C.16 (SG26) lettered CK showing MISPLACED CHECK LETTERS tied London Inland '42' numeral. Back stamped SP/25/1855. Difficult stamp on cover. Cat £225.00 (Ref 34165).