Hi Steph! This is almost impossible to find out; here's why......there are quite a few fabric manufacturers....mostly Asian......then all the various fabric companies buy from them and put their own names, #'s, etc. on them. Also, some higher end companies will contract to have these manufact. make their custom lines. You are looking for a needle in a haystack!
However, this fabric looks like a basic " novelty " fabric. Try to check out fabric.com
if you have owned this that long, it is most likely discontinued and no longer available to buy.......only at a garage sale......sorry, but, wanted to advise. Joan

Oh, wow! I had no idea, definitely disappointing. I am thinking it is discontinued, too, I am going to check fabric.com just in case, though. Thank you so much for taking the time to respond, I really appreciate it, Joan!

To me the printing style and subjects look really old, like 50s/60s/possibly 70s.

As for that specific fabric, no idea. But a lot of companies now make 30's reproduction fabric that looks very similar. For example:

Here is a link that might be useful: 30's reproduction fabric

Thank you colleenoz and clt3! I think the 30's reproduction is exactly what I was looking for!