Violet rubber handstamp overprint ("PORTO", size 17 x 3½ mm) made in Rajcza. Rajcza is a village south of Żywiec near the Slovak border in south Poland.
Pd 1 (75B)
Pd 2 (76B)
Pd 3 (77B)
Pd 4 (78B)
Pd 5 (79B)