Hello again,
I found the very similar "Walpurgis" bowl on the GTS site and searching from that found the 2014 thread on GMB.
I'm wondering if any further information has turned-up about it since then? Was it ever established whether it was part of a set, a stand-alone powder or trinket bowl or just a similar looking piece of tableware?
I found this one in a charity shop recently.
TIA for any help.