Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 899:
POSTAGE DUE STAMPS : 1920, 5c orange and magenta, inverted numeral and black overprint ”Colonia Eritrea”, bottom sheet margin block of four, full OG, NH, F/VF and very scarce double error multiple, expertized by Dr. Bolaffi and G. Oliva, C.v. $2,200 as hinged singles, Sassone #14a, €6,000 as singles, Est. $800-$1,000, Sc. # J1bc
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