8c Violet Brown, USIR Watermark (272a). With clear "R" of watermark, deep rich color, neat strike of town datestamp, Very Fine and choice, the "USIR" (United States Internal Revenue) watermark error occurred when a supply of paper reserved for revenue stamp production was used for printing the 6c and 8c postage stamps, there are approximately 75 known of the 8c, but many are either off-center or have flaws, collectors prefer examples showing the "R" watermark, as this letter is unquestionably from "USIR", ex "Natalee Grace" and Dr. Heimburger, with 1998 P.F. certificate

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