6c Green & Black on Violet Paper, Proprietary (RB6a). Block of 36 with bottom imprint and plate no. selvage with both plate nos., original gum, few h.r. including some perf separations sensibly reinforced, few adherences, few small faults as often seen on large multiples, Fine-Very Fine appearance, this is the largest recorded multiple for this issue, the next largest is a block of 24, ex Joyce and Wampler, Scott Retail $3,050.00 as used blocks of four and pairs with no premium for the plate block

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