Auction 90, Session 2 - Worldwide Rare Stamps and Postal History
Lot 928:
1936, Pioneers Helping Post, 1k-15, perforation 14 and 11, two complete sets of six, full OG, all are NH (5k with perf 11 has natural spot of gum skip), VF, C.v. $243, Sc. #583-88, a
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