Thanks for all of the great information!
I found pictures of the warming element on line. I've seen many of them in thrift stores over the years and never knew what they were for because they were always separated from the pot.
Paul, thanks for your offer, but there's no need to go to the trouble. I like the piece as is, and will likely use it as a Patio Server by itself. If I happen upon a warming base -- and it's possible the one for this pot is kicking around at Savers right now -- I'll grab one, but for now I'm viewing it as just another thing to have to store.
I swear I've seen this pattern on other things, like on the handles of wooden salad utensils, but I could be thinking of something not exactly the same.
Meanwhile, July 4th is almost upon us and I'll be hosting what seems to have become my annual 7/4 bar-b-que, so the Patio Server will be making its debut soon.