The above set listed on this site is just confusing.
Here you have listed the third Zolty series denominations of - 2, 20, 50, 100, 200 and 500 zlotych, as per link below.
https://en.numista.com/catalogue/pologne-banknotes-3.html#c_pologne199
If you scroll down the above page, you then find the following notes listed under the fourth Zolty heading for 1, 5 and 10 zlotych
Also the Pick reference #s are inconsistent too and some are wrong too. I believe there should 3 references
P164 to 172 - un issued note
P164a to 172a - overprint with ‘’NIEOBIEGOWY''
P164s to 172s - Specimen (if any) ??
In my opinion, the description as trial banknote is also incorrect too. They printed it but then decided not to release it due to various reasons. It should be listed as un issued notes.
Thanks