13c Colorado Statehood Centennial, Horizontal Pairs, Imperforate Between and Vertically (1711a, 1711b). Mint N.H., first with wide natural s.e. at right as listed, bright colors, Very Fine, No. 1711a is listed but unpriced in both Scott and Datz, the latter stating "very scarce", No. 1711b Scott Retail $650.00, these are the first examples we have offered since keeping computerized records

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