FINE AND VERY RARE SOUND EXAMPLE OF THE 1917 12-CENT PERF 10 AT BOTTOM. ONE OF THE RAREST OF THE PERF 10 ON ONE SIDE VARIETIES WITH ONLY 16 USED COPIES RECORDED IN THE SIEGEL CENSUS.
Our census of Scott 512b, available at our website at https://siegelauctions.com/census/us/scott/512b , contains only 16 used, one on cover and four unused examples of this rarity. Only five used examples are confirmed as sound; eight have faults and three need to be reexamined for condition.
Census No. 512b-CAN-08. Ex Twigg-Smith. With 1991 P.S.E. certificate