Ukraine #4 Surcharge question

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


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