Great stem and foot! Interesting, very nicely cut piece.
Hmmm, is this another case of different US/UK terminology? I don't seen any of what we call hobstars. And I've been wanting to ask about what you all think of as a pinwheel, too. In the US, the first motif shown below is a hobstar, and the second a pinwheel. I believe I've seen the first one called a pinwheel by the British, though. US Hobstars have many deep cuts between the points of the star, creating facets on the "hob" in the middle (the photo makes it look sunken, but it's actually raised). There are as many facets on the hob as there are points in the star.