On stamps with a large top margin there is a large guide dot traversed by a horizontal guide line near the upper right corner. In his notes, Marler mistakenly identified this position as 10LR1, but to be directly under 10UR100, the position must be 10LR10.
Research notes:
This item was not listed in his book, but was present in Marler's personal collection with the suggested plate position annotated.
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