1915 (Feb. 20) Experimental Hydro-Aeroplane Mail Flight, Tacoma to Seattle, Wash. 2¢ carmine entire with Tacoma corner card addressed to Seattle, Wash., purple "Aeroplane Mail, Carried between Tacoma & Seattle, By Gustav Strohmer" flight cachet handstamp, cover without origin or receiving backstamps, Very Fine, a very scarce flight with only 45 pieces of mail carried. AAMC No. 82. Estimate  $200 - 250. $0 (Image)