Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1

United States - Modern Errors

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Start price: $500

Buyer's premium:

1980, Architecture, 15c x4 black and red, top right corner sheet margin Plate No.39429 se-tenant block of four, upper stamps (No.1838-39) with missing red color due to strong perforation shift, full OG, NH, VF and extremely rare, Scott Errors Cat. listed No.1838a with ”-” and not listed variety on No.1839, probably by mistake, Est. $800 -$1,000, Sc. #1841a var