Luxembourg 28.11.1914 P-21 PMG Choice UNC 64 EPQ 1 Frank = 80 Pfennig
Single finest PMG graded example of this scarce World War I dated issue from Luxembourg. Not a type that shows up in quantity (and it never did) and one of those underrated European countries.
PMG Population in 64 EPQ: 1 (0 Finer)