375rd Heinrich Köhler auction - Day 1

1868, letter sheet franked with 2 different shades of Athens consecutive printings 20 l. (blue and deep dark blue) from Patras 8.7.68 to Constantinople via Athens and Piraeus 10.7.68 () with adjacent boxed "Affranchissement Insuffisant" and marked in red crayon "5" lepta, paid with a 5 l.. Very unusual, rare shade of the one 20 lepta; vertical cover crease and some minor staining, all stamps with very nice margins and fine appearance