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There are six types of dark violet rubber handstamp Cieszyń overprints. Five of them (types 25-29) are "PORTO" overprints and one (type 30) shows "PORTO" with a Polish eagle above it. Cieszyń is a town in the Polish/Czech border.
Cieszyń 1 Type 25 bold "PORTO" overprint size 18-21 x 4 mm
Cieszyń 1 Type 26 "PORTO" overprint size 20 x 4 mm
Cieszyń 2 Type 27 "PORTO" overprint size 19½ x 4 mm
Cieszyń 2 Type 28 "PORTO" overprint size 19½ x 4 mm
Cieszyń 2 Type 29 "PORTO" overprint size 20 x 4½ mm
Cieszyń 2 Type 30 "PORTO" with Polish eagle overprint size 13½ x 13½ mm