This is Polish Muza SX0431 (12-inch, stereo). Completely unreleased. Unopened, new. Still sealed in its shrink wrap. Slight wrinkles due to the compression of the shrink wrap. There is no better condition for this record. The recording includes: J.S. Bach "Partita No. 2 in C minor, BWV826" Beethoven "Piano Sonata No. 6 in F major, op. 10-2" Schubert "Impromptu in G flat major, op.90-3" Schubert "Impromptu in A flat major, op.90-4" The performer is Maria Grinberg (piano). Recorded in the early 1960s. A masterpiece that needs no explanation. A Terra Rare record.