Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 220:
1991, Kestrel 1c and Bluebird 3c, imperforate 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 ”-”, Est. $300-$400, Scott #2476P/ 2478 P
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