Tibet Scott 13 Unused Full Sheet of 12 with 2018 Sismondo Certificate - Pin-perf 10, full sheet of 12, unused, without gum as issued. Original purchase paperwork from 1956 included as well as 2018 Sismondo certificate stating "it is genuine in all respects...the sheet is in excellent state of preservation....". (SCV $1140 as singles) (Image)