FINE. AN EXTREMELY RARE SOUND EXAMPLE OF THE 1917 12-CENT PERF 10 AT BOTTOM. ONE OF THE RAREST OF THE PERF 10 ON ONE SIDE VARIETIES.
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-10. With 2008 P.F. certificate (VG-F 60)