12c Brown Violet, Imperforate Vertically (564a). Pair, with Kraft paper "official paste up" on back as often found, couple thin spots not noted on accompanying certificate, Very Fine appearance and extremely rare, with 1975 P.F. certificate for block, according to Gary Griffith, this was first listed in the Scott Catalogue in 1936 based on a find reported by Spencer Anderson, apparently one pane was discovered in which the top three rows showed no vertical perforations, assuming no others were found this would make only 15 pairs of the variety

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