Ukraine #4 Surcharge question

Mark Scheffler · January 2023

Can anyone help me with some additional background on this stamp. Scott catalog includes a note "Ukraine Nos 1-5 surcharged in grivni (hryven) with the Polish eagle were sold as Polish occupation stamps. They are of private origin." But no info on value, etc.
The image I show is a Ukraine #4 with this surcharge. Any guidance on what it might be worth and additional information on the background (especially "private origin" comment). Thanks in advance.
Ukraine 4

Michael Generali · January 2023

I found nothing in Michel or Gibbons about these.

Mark Scheffler · January 2023

Thanks for checking Michael. I will keep looking. Anybody else have a clue?

Lauren Cochrane · January 2023

Forgeries of these stamps are printed on very thin, glossy paper.
https://www.stamp-collecting-world.com/ukrainestamps_1918p.html

https://www.upns.org/intro-ukrainian-philately

https://diasporiana.org.ua/wp-content/uploads/books/21531/file.pdf
Page 102

http://bigblue1840-1940.blogspot.com/2016/10/ClassicalStampsofukraine-and-forgeries.html

Mark Scheffler · January 2023

Wow - thanks for the exhaustive set of docs on Ukraine stamps. I think your very first statement kind of fits this stamp and I also did not see this exact type of overprint anywhere in your docs. Page 102 does give a good description of the history of this "Polish" overprint and its use. I appreciate that info.
So - makes sense to not try to list this one.
I appreciate your help on this.
Mark S.

Ukraine #4 Surcharge question

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