£500 - £600
1917 (Apr) 1.E.F 3a with upper gutter margin used on piece, the stamp and margin both with type M5 Mafia overprint applied in violet to the stamp and in green to the margin, cancelled by part Mafia double ring datestamp. Rare and unusual, the overprint apparently applied once on each sheet within the gutter margin prior to the stamps being overprinted, therefore sometimes occurring in a differing colour to the stamp overprint, very few examples recorded. S.G. M48. Photo on Page 182.
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