From an an older request I created a recipe for Rzeczpospolita
rzeczpospolita.zip
As far as I can tell it actually works - on calibre's viewer -, but when I transfer it to my Sony PRS-600 all the Polish special characters are gone. I suspected that the fonts on my reader are limited to the latin1 charset, but then I read this:
https://www.mobileread.com/forums/showthread.php?t=64989
so I started to doubt that again.
Thoughts, anyone?