Hello, I was going thru some items I had stashed away and ran into this sheet of Cinderellas. In deciding on whether it was something I should keep or perhaps sell I searched around to see if any were selling. I found one
ebay listing for a single stamp from the sheet, sold earlier in the month for $20 and not much else anywhere. Below is the item description from that listing. Anyone familiar with these sheets? Are they out there? My sheet came to me separated in two below the stamps, as you see in the picture. Also a few separated perfs in the upper left. The stamps were engraved by Czeslaw Slania , which probably added to that sales value. There is nothing on the bottom sheet that is covered by the top overlay. I don't usually pop on asking about value but i'd be more inclined to keep it if it is a "scarce" item. Sorry for the bad scan, the stamps have much more detail then showing in the picture.

Below is the item description borrowed from the
ebay listing I mentioned,
Scarce 1964 Poland (Printed In The United States) Poster Stamp Millennium Of Poland. Wroclaw. Warsaw. Czestochowa. Vilnius. Lviv. Published By The Polish Veterans Association In America SPK USA. Dana Jarry. Cz. S#322;ania Engraver Unused No Gum
This Poster Stamp Was Issued In 1964 To Commemorate The Millennium Of Poland, Celebrating 1000 Years Of Polish History And Christianity, And Produced For The Polish Diaspora In The United States. The Design, Printed In Green, Combines A Map Outline Of Poland With Views Of Major Landmarks Including Wroc#322;aw, Warsaw, And Cz#281;stochowa, Along With The Heraldic Crests Of Wilno (Vilnius) And Lwów (Lviv), Cities Historically Tied To Poland But No Longer Within Its Borders After World War II. At The Lower Right Appears The Inscription SPK USA, Representing The Polish Combatants Association In The United States, The Issuing Organization Responsible For Distributing These Labels As Patriotic And Cultural Emblems. The Stamp Was Designed By Dan Jarry Of France And Expertly Engraved By Czes#322;aw S#322;ania, Whose Signature Appears At The Lower Edge, Adding Considerable Artistic And Philatelic Value. This Issue Was Printed In The United States In Sheets Of Nine Stamps And Issued As A Commemorative Place Card Published By The Polish Veterans Association In America, Serving Both As A Symbol Of National Pride And As A Cultural Souvenir That Preserved The Memory Of Poland's Heritage Among Exiles During The Cold War. Visible Text (Rewritten In Sentence Form): Polish: Milenium Polski. Wroc#322;aw. Warszawa. Cz#281;stochowa. Wilno. Lwów. SPK USA. Dana Jarry. Cz. S#322;ania Sc. — English Translation: Millennium Of Poland. Wroclaw. Warsaw. Czestochowa. Vilnius. Lviv. SPK USA. Dana Jarry. Cz. S#322;ania Engraver. Country Of Origin: United States (Polish Exile Issue) Year Of Issue: 1964