Cherry International ran casinos in Eastern Europe, Sweeden as well as on cruise ships and ferry's. Some of the chips used on cruise ships can be seen at:

http://shipsandchips.net/browse?bc[casino_loc_major]=%28All+Ships%29&bc[casino_name]=Cherry+Maritime+Gaming&page=1

http://www.themogh.org/cg_chip2.php?id=WTCMGA

http://en.cherry.se/#

According to the Cherry web site they, operated casinos in Eastern Europe from 1986-1991. I do believe your chip may be from that time frame, from Poland.