24c Carmine Rose & Blue, 1918 Air Post, Grounded Plane Variety (C3 var). Horizontal pair, attractive margins and centering, neat strikes of “(An)acortes) Wash.” double-oval cancel, both stamps with clear vignette shifts, the right stamp’s wheels a bit lower than the left, faults including light creases, tiny edge tears on left stamp and reperfed at bottom — none of these flaws are obvious or affect the pair’s appearance

VERY FINE APPEARANCE. THIS IS THE ONLY RECORDED USED MULTIPLE OF THE 1918 24-CENT AIR POST ISSUE GROUNDED PLANE. ONE OF THE GREAT RARITIES OF AIR POST COLLECTING.

Research by Joe Kirker and Don David Price found five or fewer used examples of the Grounded Plane off cover, including this pair and the two singles offered in lots 15 and 16. Kirker's updated census of covers bearing the Grounded Plane stands at 15 examples, including one offered in lot 18.

With 2009 P.F. certificate

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