15c Blue, Special Printing Without "Sample A" Ovpt. 189SL var). Horizontal block of twelve with top part imprint, plate no. 31 and imperf half arrow, almost a complete plate block, original gum, some h.r., exceptionally well-centered, Very Fine, the 1889 "Sample" and "Sample A" overprinted stamps are referred to as "Special Printings" in the Scott U.S. Specialized Catalogue, and the "Sample A" colors are essentially the ones adopted for the subsequent 1890-93 Small Bank Note Issue, Scott Retail as twelve singles

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