Nagrania Dźwiękowe

"Nagrania Dzwiekowe" isn't a label, it just mean "Sound Recordings". Pressing company name ("label") is usually on reverse or rim, stamped or pressed, sometimes "Nagrania Dzwiekowe" exist as part of company name tohether with owner name, for example: "Nagrania Dzwiekowe Stanislaw Izdebski". It's not the name of label itself, it's just description.