Very faint doubling in the lower portion of the stamp with the 'E' of Ten, the bottom of the right numeral box and leaf one on the right the most visible.
Research notes:
This image was provided by Leopold Beaudet and is from a plate strip of the dry printing. Plate 21 was used to print both the 10¢ Blue and the 10¢ Bistre and the same re-entry is found on a 10¢ Bistre.
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