3c Deep Violet (537a). Rich color, well-centered for this rare and notoriously challenging stamp and shade, Salem Ohio oval registry cancel, Extremely Fine, a rare sound and well-centered used example of this color variety with a handstamped cancel rather than the Salem Ohio precancel, our census of Scott 537a in used condition, available at our website at http://www.siegelauctions.com/dynamic/census/537a/537a.pdf , records a total of 19 used singles and two used blocks of four -- of the singles, 11 are precancelled (all at Salem Ohio), and of the 8 singles without precancels, the example offered here has the widest margins -- Census No. 537a-CAN-03, ex Natalee Grace, with 2000 P.F. certificate

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