Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 450:
1991, definitive issue, kestrel 1c and bluebird 3c, imperforated proofs in horizontal se-tenant strip of four with gutter in the middle, light fold along the gutter, still full OG, NH, VF and rare, se-tenant gutters of such proofs are listed, but priced with ”-” in the Cat., Est. $500-$600, Sc. #2476-78 P
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