1c-6c 1875-83 Proprietary, Large Die Trial Color Proofs on India (RB11TC1a-RB14TC1a, RB16P1-RB17P1). 1c-4c are trial color proofs in Black, 5c and 6c in Black and Violet Blue respectively (both as issued and so die proofs), each proof showing huge margin at bottom and "National Bank Note Co. N.Y." imprint, a few India paper translucencies, the 5c with thin spots, otherwise Very Fine, a rare group, the trial colors for this series are unlisted in Scott, the large die proofs in the issued colors catalogue $500.00 each

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