thanks for the sleuthing Anne
- and certainly the three examples you have linked appear identical in design, and differ substantially from my posie bowl. The most obvious noticeably ways in which my bowl is different are:..................body is more bulbous and terminates in a large flared foot. Mine does not have the 'bird bath' base, and instead has the typical Stuart flat base with high quality ground/polished pontil mark. On mine, the large flat top drops into the well sharply, rather than curving gently, and whereas your three show twelve moulded lines traversing the top, mine has sixteen.
I'm not sure what source was used originally for provenance re Tony Hayter's example - I wasn't able to see an image when I had a look in my books, which was admittedly not very thorough.
However, in view of the backstamp on my bowl, no doubt of its origins. I could be completely wrong, but don't recall seeing any Stuart production that glowed.