Violet rubber handstamp overprints ("Porto", size 13 x 4½ mm) made in Nowy Sącz. Nowy Sącz is a city in southeast Poland.
Pd 1 (74A)
Pd 2 (76A)
Pd 3 (73B)
Pd 4 (74B)
Pd 5 (75A)
Pd 6 (76A)
Pd 7 (77B)
Pd 8 (78B)
Pd 9 (79B)