Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1

British Commonwealth - Aden Protectorate States (South Arabia) - Kathiri State of Seiyun

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Start price: $100

Buyer's premium:

1966, Sultan Hussein, trial black instead of blue bilingual surcharge 5fi on 5c brown, left sheet margin block of six (2×3), full OG, NH, VF, SG #55 P, Mi #55b, C.v.€900++, Est. $200-$250