Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 409:
1983, Volunteerism, 20c red and black, left sheet margin block of four with control ”3” on the selvage, full OG, NH, VF, C.v. $450 as two pairs, Est. $200-$240 , Sc. #2039a
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