10 VFNH LR plate 1 blocks of 4 of the 5c & 7c rose lilac - blue Sir Casimir Gzowski - Jet Plane from the 1963-1966 Commemoratives & Definitives. #420 and #421 are on a variant of the DF paper that contains sparse fluorescent flecks. It is not the fluorescent paper, but is nof full dull either.
Unitrade values these at $19.75. The blocks offered here grade between 75 and 84 as follows:
