I haven't a clue what this could be. I thought it might be a flower frog, but if it is, which way up does it go? Would the centre hole house a figurine? It measures approx. 3¾" square and 1¾" deep. One end is nicely polished and the other has a flat round rim.
I may be way off with my flower frog idea and it might be for a light fitting of some sort. Pic.3 certainly looks like a frog - a headless one.
Any ideas please?