NIGERIA = 2006 N50 Stamp Duty Revenue Issue Used. Postal Cancel. MAJOR VARIETY! Mis-Perfed so that Imprint is at top of each stamp. Bottom stamp is wrinkled but should flatten when removed from piece. Never seen this spectacular error before.

You are buying the 2006 N50 stamp duty revenue issue, used with a nice postal cancellation.  This item was not issued as a postal fiscal stamp, but was occasionally used on mail, probably out of ignorance.  This item is noted in the Scott Catalogue, but not priced.