I came across a particular Nigeria Error Sheet that I unknowingly picked up as a lot during my visit to the Nigeria Post Office in Kano city in 2007.
I tried some searching online whether any other such reported errors are existing but couldn't find anything. So I hope the folks here at Stampboards can help me out.
It is a 2001 Definitive Issue featuring Preuss's Monkey... any inputs regarding the rarity of this error and possible valuation of it would be more than welcome.
Thanks in Advance....