Reorganising the house a bit, has made certain long lost (or hidden) items reappear. I just rediscovered these yesterday.
I bought this rather strange pair of bowls many years ago, and asked the seller if he knew what they were; he had no idea. But I have a feeling that they had a specific purpose in life!
They are quite chunky, with a simple brown glaze on the inside, and a yellowish five pointed star looking up from the bottom. They measure 6½ inches (17 cms) across the top, and have 163A stamped into the base; there's no makers mark.
I'm not certain, but they look as if they may well have been used in an oven.
Any ideas, invented or otherwise, gratefully received.