National Bank Note Co., Lowenberg Patent, 3c Plate Essays on Onion Skin and White Chemically Treated Papers (79-E8a, 79-E9e). Four complete sheets of 25 of No. 79-E8a, in Black, Dull Pale Violet and Orange Brown, typical minor flaking as always with this fragile paper and ink, Very Fine, also one complete sheet of 25 of No. 79-E9e in Brown, this is the essay that changes color to blue if moistened, evidence of that at upper right corner, couple minor edge nicks and some light toning along one edge, still Very Fine, total Scott Retail as singles more than

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