3c Bright Mauve, National Defense, Large Die Proof on India (901P1). Die sunk on 150 x 202mm card, at the top of the India paper is albino embossed "Education Security - Education Conversation Health", handstamped on back "Engraver's Stock Proof,/ Authorized by" with brown initials, also blue control no. 656983A, tiny corner crease at top left, Very Fine, ex Livingston, the Shreves catalogue for that sale states this is likely the only known example in private hands, with 2006 P.F. certificate

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