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

United States - Modern Errors and Varieties

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Start price: $250

Buyer's premium:

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. $500-$600, Scott #2476-78 P