35c Glenn Curtiss, Light Blue Background Omitted (C100a). Mint N.H. top left corner Mr. Zip transition block of four, left stamps errors with background completely omitted, right stamps partly omitted, Very Fine and choice example of this distinctive and extremely rare error, the Datz book states that this is the unique pair, with 2007 P.F. certificate, Scott Retail as singles without premium for the transition block, accompanied by normal for comparison

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