3c Violet, Ty. III, Printed on Both Sides (529b). Horizontal block of ten with bottom right corner selvage and plate no. 8629, some hinge reinforcement, the impressions of the reverse are inverted with respect to the normal side and are shifted to where one stamp receives a very off-center complete impression while the one above only perhaps one-quarter impression, the same is true on the back of the blank right selvage, a rare block, ex Brett, with 2009 P.F. certificate, cataloged as two error stamps

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