Atlana Rhythm Single
Here's something you don't see very often - a jazz 7" 45rpm single. Based on the fact that it has the generic RPC label it's fairly obvious that this was a private custom pressing (that's what RPC/RPL of Camden, NJ primarily does), likely for sale at local gigs. The intertubes are remarkably silent about the Atlanta Jazzmen, though having a fairly generic band name doesn't help one to sort out the numerous google hits.
Side A is John Mandel's Pernod, while Side B is Sunday, attributed to Miller-Cohn-Stein (which seems to be short one composer).
The Atlanta Jazzmen