GB 1869 QV 6d Purple Pl. 8 Spray Wingmargin (FE) IONDON-E. C. / 91 POSTMARK ERROR

27.3.1869, QV large white corner letters 6 d mauve Pl. Wing margin at left ('FE') on superb entire (very early usage) with fine red oval PD, transit cancel "FRANCO (AUS ENGLAND PER AACHEN)" (in blue colour) and barred Duplex-cancel IONDON-E. / 91" (East Central District, Dubus Type 19, code X) via Ostend to Leipzig, extremely rare postmark-error: "IONDON" instead of "LONDON, - NEW EARLIEST USAGE DATE 27.3.1869 (till now November 1877).

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