Lot no. 309

1919, 1st Kaunas Issue 15 sk., block of four from the lower right sheet corner, the lower right stamp with error "5 instead of 15", used with clear cds. "KAUNAS 12.II.19", right upper and lower left stamp with tiny stain, otherwise a fine copy of this rare and popular error, signed Friedel, Köhler and certificate Huylmans BPP