Lot 8791906, 1¢ blue green, imperf, horizontal coil, strip of six, in combination with Airmail 1918, 16c green + 1918, 3¢ purple, type IV (C2+530) on 2¢ carmine flight entire, all tied by "Air Mail Service Wash. N.Y. Phila., Phila., Oct 12, 1918" duplex postmarks; third stamp in strip with small hole at upper left, otherwise Very Fine, a late usage of the very rare 1906 1¢ horizontal coil usage, quite possibly the largest known multiple on cover, Scott catalog $2,000 for pair on cover; with 1986 A.P.S. certificate.
Scott No. 314H Estimate $750 - 1,000.