Polish Overprint

What is the story behind these ?
dont know much about them.
I have the original ones too without the overprint.







thanks in advance guys

These were the 1918 Lublin issues


Edit: added map

Described in Scotts at the Lublin Issue 1918. Austrian Military Semi-Postals overprinted. There were issues for several Polish cities.
"Local issues were made in various Polish cities during the German occupation. In the early months of the Republic many issues were made by overprinting the German occupation stamps with the words Poczta Polska and an eagle or bars often with the name of the city."

Thanks for the info Russ.
I was thinking the same about the cancellations.
As you beyern1Kreutzer

This is a regional issue vs local and for that reason is omitted from "Poland, 1918 Locals", by Barefoot. After independence Poland was divided in 4 regions each issuing it's stamps/overprints; Warsaw, Lublin, Cracow & Pozan. Then in 1919 this was reduced totwo region North & South Poland due to currency differences. The 1st united Poland issue is the set listed as Scott's 133-5, 37 later in 1919..