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

United States - Modern Errors

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Start price: $750

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1993, American Musicals, three imperforated proofs of se-tenant booklet pane of four 29c values in full color, as well as in blue only and in blue and magenta colors only (design is slightly different of issued stamps), all with full OG, NH, VF and rare, C.v. $1,250 for finished design pane only, others priced with ”-”, Est. $1,200-$1,500, Sc. # 2770a P, b, c