Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 400:
GROUP OF PLATE AND TRIAL COLOR PROOFS: 1875-95, 9 items, including five horizontal or vertical pairs (1) and four blocks of four, all printed on stamp or wove paper, several thins and some gum defects mentioned, part of OG or unused, F/VF, C.v. $3,560, Est. $800-$1,000, Sc. # 178 P5/273P5
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