FINE APPEARANCE. ONLY 16 USED EXAMPLES OF THE 12-CENT PERF 10 AT TOP OR BOTTOM ARE RECORDED IN OUR CENSUS. ONE OF THE RAREST OF THE PERF 10 ON ONE SIDE VARIETIES.
Our census of Scott 512b, available at our website at http://siegelauctions.com/dynamic/census/512b/512b.pdf , contains only 15 used, one on cover and four unused examples of this rarity (including a pair).
Census No. 512b-CAN-13. With 2009 P.F. certificate