Airmail, 1926, 10¢ Map & Planes (Scott C7), bottom right full pane of 50, plate #18246 with siderographers initials C V De B, initialed and signed and dated on day of issue by H.J.N (Harry J New, Postmaster General) and 3rd Asst Postmaster General R. S. Regan, o.g., never hinged; few perf separations, Very Fine. Estimate value $200 – 300 Great exhibition item .
Daniel Kelleher Auctions, May 2014, Sale 652, Lot 828
10c Map, Air Post (Scott C7). Mint N.H., mathematically perfect centering, bright shade, Extremely Fine Gem, with 2010 P.S.E. certificate (Gem 100, unpriced in SMQ above the grade of 98, SMQ $245.00 as 98)
Robert Siegel Auction Galleries, Dec 2010, Sale 1000, Lot 1261