3c Purple, Ty. IV, Double Impression (530a). Showing clear doubling of the entire design, rich color, neat wavy-line machine cancel, horizontal crease ending in tear at left, Very Fine appearance, a great rarity, our census of Scott 530a, available at our website at http://siegelauctions.com/dynamic/census/530a/530a.pdf , records approximately 141 unused copies (including a pane of 100) and three used (two off cover), with 2004 P.F. certificate stating it is a genuine double impression but declining opinion as to the cancellation, with 2007 P.S.E. certificate making no such qualification, offered on its own merits

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