Interesting. I didn’t know Synthetic Plastics licensed any of their stuff — that’s the New Jersey plastics factory that issued LPs on Promenade and a bunch of other made-up labels, but mostly on Spin-O-Rama and Diplomat. Their pressings are always on cheap, noisy vinyl, but this one sounds like it’s much better quality.
However, don’t pay too much attention to the artists’ names because they’re usually fake — the names and LP covers change every time they’re reissued.
BTW, if you come across anything licensed from Prom, Colortone, Audition, or Grand Award, those budget labels are from Enoch Light, who was also based in New Jersey — he did a lot of licensing. He eventually hit it big with those sterophile LPs on his Command label in 1960.
The Enoch Light budget labels often used top session musicians like Dick Hyman, who were later featured on the Command LPs, so they’re considered “collectibles”.