cover 5c Rose error (505), fine single tied on 1918 flight cover to Washington, D.C., the other purely philatelic additional frankings incl. no. 320b vertical pair with plate no., nos. 299 and 326 with B. plate nos. and no. 462 single on a 2c Red on white entire (U429), all tied by faint magenta "Air Mail Service, Wash. N.Y. Phila. New York May 15 1918 First Trip" flight cachets, the error stamp was calculated as 2c to make up the 24c air mail rate, a heavy cover abrasion just below a couple stamps (to eliminate a typed comment) which just breaks the paper, minor edge faults, unquestionably philatelic, but genuinely used on cover, the error is fine, Scott retail $1,500.00 (Scott retail as used stamp $500.00) photo