375rd Heinrich Köhler auction - Day 1

1863, "Eplirothi" (=paid, used by a Greek ship) oily blue octagonal marking, on letter sheet from Mytilini (Lesvos island) to Syros 30.3.1863, rated "20" in red crayon, paid with a pair Athens provisional printing 10 l. (left stamp cover crease), very interesting and fine