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There are three types of Leżajsk "PORTO" overprints. Leżajsk is a town northeast of Rzeszów in southeast Poland.
Leżajsk type 72 is a black or violet rubber handstamp "PORTO" overprint (size 17 x 4 mm).
Leżajsk type 73 is a black metal handstamp "PORTO" overprint (size 19 x 4 mm).
Leżajsk type 74 is a black wooden handstamp "PORTO" overprint (size 29 x 7½ mm).