50c Violet (421). Left plate no. 7040 block of six, bright shade, left column well-centered, perfs at right a bit close but clear

FINE-VERY FINE. THE 50-CENT PERF 12 WITH SINGLE-LINE WATERMARK IS EXCEEDINGLY RARE IN PLATE BLOCK FORM.

As a measure of rarity, the Wampler collection had a hinged top plate block, and the Fogelson collection did not have a Scott 421 plate block (both Shreves sales).

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