I totally agree with Jim that the sax solo is a baritone sax and not a bass sax, as I told Albert that I thought it was a baritone sax solo when I sent the mp3. Albert thinks it is a bass sax solo, so we have a divergence of opinion here!
I also agree that it is unlikely to be a California Ramblers date. Brian Rust states (in Jazz Records) that, for this session, the Fred Rich Orchestra is "Apparently a cover name for at least some of the California Ramblers". I don't see the need to state it in this way, which is somewhat misleading. One could just as easily, and more logically, state that "this Fred Rich 'studio band' session features some musicians more usually associated with the California Ramblers"!