Polish (formerly state-owned) record company active mainly reissuing remastered recordings of classical music, operas and the series. It was acquired by the Polish branch of Warner Music in 2015. Some useful information which could be helpful when establishing the year of release of LPs (up to year 1991) or at least the years range: Prefix SP - 7'' / 45 rpm mono single play SS - same line as above, but in stereo (from mid 70's) N - 7'' / 45 rpm mono EP SN - same line as above, but in stereo (from mid 70's) L - used for 10” / 33rpm longplays for 12'' longplays: XL - used for mono LPs – up to… via Discogs →