17c Black, Large Die Proof on India (623P1). Die sunk on 198 x 147mm card, typed "Approved November 30, 1925. Postmaster General" and signed by Harry S. New, blue control no. 1360804 on back, two trivial toned spots on India paper at bottom far from stamp design, Very Fine, ex Finkelburg, Scott value for a normal large die proof (it is listed out of order in the Scott Catalogue, making it difficult to find)

Image Magnifier / Download

Power Search for Comparables