Three original 60's sound postcards from Poland.In the 1960's in Poland,vinyl records by western popbands were banned. In order to avoid the ban ( + copyrights) some firms made clear plastic soundsheets which they stuck on top of ordinary postcards. This would combine a traditional rather old -fashioned postcard with subversive music pressed on the top of it. It was probably the only way for the polish yuoth to enjoy western popmusic. By the early 70's the postcardsheets were discarded and substituded for solid plastic cards without the postcard.the original postcards are these days impossible to find and are very nice original items of the sixties. these sheets were dubbed from discs and are of only very low fidelty.