Austrian stamps overprinted "Poczta Polska".  They were issued from Krakow for use in southern Poland, early in 1919, using the Halerzy/Korona denominations.
3, 5, 6, 10, 12, 40, 50, 60, 80, 90 Halerzy, 1, 2, 3, 4 and 10 Korona in this series.  Some of these stamps are very rare and valuable.  Many excellent forgeries of the overprint have been made.

Another Austrian stamp, surcharged 25 Halerzy.  Reverse is "signed" and marked as "Expertized" in Lwow.  Some signatures are those of experts who authenticated the stamp.   Some signatures are those of the owner.  Many signatures are faked, in an attempt to increase the value of the stamp, or to help pass off a forgery.  Many stamps (real or fake) do not have a signature.

Newspaper stamps issued from Krakow. 5 values in this set.
Postage due on Austrian Porto (postage due) stamp.

Good page with info on Krakow Overprints 1919


Overprinted Austrian stamps as issued in Lublin, late 1918.  Issued in the Halerzy denomination.  Reverse is "signed" (in pencil in this case).  Other types of Austrian military FELDPOST stamps (similar to the one below, but with a "Poczta Polska" / Eagle overprint) were also issued from Lublin.  Forged overprints exist.

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