A specialized group of 11 VFNH lower left inscription blocks from the 1977 through 1979 Christmas issues, including up to three different types of paper, when viewed under UV light from the back. I have identified DF, DF-fl, LF-fl and MF-fl papers, but note that my fluorescence levels are not as bright as what is listed in Unitrade. For example the LF 17c 1979 Christmas is really more of a MF in reality. What I identify as LF would be a considered a variant of the basic DF paper, but it is visibly different. Unitrade cat for basic blocks is $20.75. The blocks offered here grade between 75 and 84.
