Notgeld 50 pfennig iron 1917 Solingen

Hello, does anyone have an idea of ​​the price for this 50 pfennig 1917 from Solingen, it is made of iron covered with a silver-colored anti-rust, it is the F#508.2b variant, apparently unusual, but not a specialist in this type of currency, thank you

N#20408

The first stop is always ebay. here are a few recent completed sales of that coin.

hello thank you, I already looked, the one I have with the silver anti-rust is not there, the F#508.2b, thank you anyway

https://www.notgeld.com.pl/polskie/index.php?l=pl&co=solingen&acc=S

https://www.numisbids.com/n.php?p=lot&sid=3929&lot=858

https://onebid.pl/pl/monety-niemcy-50-fenigow-1917-solingen-destrukt-podwojne-bicie/1045466

https://onebid.pl/pl/monety-solingen-50-pfennig-1917/1266394

https://www.numisbids.com/n.php?p=lot&sid=1792&lot=1058

Hello, thank you very much