10c Lindbergh, Air Post (C10). Mint N.H., mathematically perfect centering with wide margins, post-office fresh color and paper, Extremely Fine Gem, with 2021 P.S.E. certificate (Gem 100), of more than 380 Mint N.H. C10's submitted to P.S.E., only eight other examples have achieved a perfect Gem 100 grade (plus two at Gem 100 Jumbo, the last example realized $8,500 hammer in our Sale 1351)

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