Rare Warsaw Uprising Letter - September 1944

Very rare Warsaw Uprising related letter dated September 1944! It's a really scarce and ultra rare item! Letter comes with Philatelistic Atest mr. Laslaw Schmutz certificate of athenticity. Mr. Schmitz is a very well know and reputed philatelistic expert. Some translation and explanation from ATEST: Warsaw Uprising letter was addressed to Jadwiga Zakrzewska who lived in Prusa street 35/ 2. It was given in the post office, the downtown-South entry field on 19.9.1944, lateral on the round sender stamp of this institution. Censorship Nº 6 was censored in the North-North box, before delivery to the addressee. The approved letter is in an average condition. It's a 100% genuine letter of how it worked the downtown post office during Warsaw Uprising.
Condition: Good condition