Thanks, mart!! I saw couple like the one you posted and the Robinson Ransbottom sponging style is so very similar, but all the ones I find the top lip is different - there is a lip or banding near the rim that mind doesn't have, and the bottom more of a footed saucer. Thanks for thinking of me when you found it!
Hosman, thanks! I think that the bowl is old as well. I'm kind of disappointed that I haven't been able to find anything out about it.
I also got a beautiful antique spongeware platter, blue on white, from the same source. Have info on this one but not the two I posted above.
Snow & Hosman, I love spongeware. Some great American (and otherwise) pottery to be found!