Perhaps it translates "Free Polish Corps." There was a Free Polish unit among the Allied forces in Italy. Might be found in Italian listings under military occupation stamps of the time. Mind you, I'm winging this!
I found "something" -- not a full listing, but my old Michel Eastern Europe catalog shows sample pictures (including an imperf souvenir sheet otherwise identical to this set), under the heading "Issues for Polish Bases in Germany and Italy". It states that these were issued under "private initiative" and that listing them in a catalog for all of Europe "is not possible".
Roy
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"BuckaCover.com - 80,000 covers priced 60c to $1.50- 10,000+ new covers coming Tuesday June 1"
CAPTURE OF ANCONA 15.7 - 18.7.44 - 55 GROSZY
CAPTURE OF BOLOGNA 9.4 - 21.4.45 - 1 ZLOTY
CAPTURE OF MONTE CASSINO 11.5 - 18.5.44 - 45 GROSZY
BOTTOM - GEN. W. ANDERS - ITALY - 17.2.44 - 2.5.45 - 2 ZLOTY
Somthing like yours Roy, info taken off internet
http://members.shaw.ca/rskulski/
Probably issued by the Polish Resettlement Corps in Italy, 1946. The Resettlement Corps was created by the British Government under the auspices of the War Relief Services (NCWC) in May 1946, and was tasked with processing the some 300,000 Polish soldiers in the western sphere of liberated Europe.
or
Think its listed in Sassone Catalog under Polish Corps in Italy
