1920s Pottery Lamp Base

OK, this is a pretty boring item to start out with. I found this at 1pm at a very random rummage sale near the 4th of July parade route. The sale had been running since 9 or 10, so I think this is a pretty good scoop for a lazy afternoon.
It's hard to guess some specifics about this piece. But that's part of the fun. Research can turn up some interesting facts, but sometimes we have to go with generalities. This lamp is probably circa 1920s to 40s. Nice art pottery base. Something keeps telling me the pottery might be French, but who knows? It's possible the lamp originally had a felt base with a sticker on it, but it's lost to time. Paid $15, hoping to get $100 on eBay!