Due to shortage of porto stamps (Postage Due) in the Bucowina area and also Suceava area (around 1919/1926) a handstamp PORTO was used.
Anyone who wants to supply further information, be my guest!
portobuk1.jpg (25866 bytes)portobuk2.jpg (24723 bytes)
25bukowinaporto.jpg (24472 bytes)

porto3.jpg (44829 bytes)
porto5l.jpg (21182 bytes)
portoyy.jpg (23930 bytes)

Courtesy Dr drag Ebay 2004:
Left image: cancel Borauti   Right image: 2nd variety? Foreign?
These two examples are from another period - as far as I know they are bogus
portofake.jpg (20491 bytes)

All images from ebay, mostly courtesy Mr Dragoteanu