1c-50c 1879 Postage Due, Large Die Trial Color Proofs in Blue (J1TC1-J7TC1). On die sunk cards, 1c-5c 57 x 67mm, 10c-50c 62 x 70mm, 1c-5c with die numbers at top, 5c and 30c insignificant edge toning spots, Very Fine-Extremely Fine
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