Auction #93 Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World

1926, Elliot-Fairchild Air Service, (25c) blue on yellow background, two complete panes of eight, one of which with inverted stamp on position 4, ''filled-in wing'' on position 1 of each pane, minor perf separation (tete-beche pair is not affected) and some selvage pieces missing, still full OG, NH, F/VF, C.v. $847.50 as singles, Unitrade #CL9, d, C.v. $1,012.50, Est. $350-$400