WHAT IS THE VALUE of the piecdziesiat zlotych 50, 1988
In 1995, Poland re-denominated its currency and did away with some increasingly embarrassing zeros. What was once worth 10 000zl became worth 1zl and is now differentiated by the tag PLN (1PLN).
Old 50zl is worth today 0.005PLN (in bank exchange).
Maybe there are some collectors who are willing to pay you something for the note, but I don't think it is worth anything yet.