50c Transport, Collateral (C31 collateral). Typed letter on White House stationery dated 5-23-41 and reading "The Postmaster General left this for your approval as to color; otherwise they have approved. The 6c air mail stamp will be issued for sale on June 25th. Frank Walker asked if you want to purchase the first stamp"., with handwritten reply below "OK-except the 50c is too close color to the 6c-make the 50c more orange-yellow" and initialled "F.D.R.", accompanied by issued copies of the 6c and 50c, Very Fine, a phenomenal collateral letter with handwritten note by President Roosevelt regarding stamp colors

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