Waltzes by Johann Strauss, Jr. was released in 1956. It is an Extended Play 45 RPM 7″ record numbered CAE 158 on the Camden label. Camden was a subsidiary of RCA, and the label states Camden is “A Product of Radio Corporation of America”. The EP consists of “Du und Du”, “Wine, Woman and Song, Op. 333”, and “Southern Roses, Op. 388”. These works were performed by the Century Symphony Orchestra.
This record has only come up for auction 4 times on eBay. The Warhol Museum has one and Paul Marechal has one, so there are at least 6 of these in circulation. If anyone knows of any other copies, please let me know.
UPDATE: Another copy has come up on eBay, making the total confirmed extant copies as at least 7.