Before giving this one an "ID" in the title, I'd like to raise some other points ...
Are we sure Chris's piece is by "Gambaro e Poggi"? The couple of "G & P" examles shown, and particularly the one in the video in the other thread, have additional and well balanced decoration to the interior and they also have coloured eyes. Chris's has clear eyes and what seems to be a plain coloured inner section that does not appear to "fill" the body.
Chris ... you say that yours is identical (in form) to the "G & P" ones. But what about the size? And with only your single picture, we cannot see the detail of how the tail is actually formed. Maybe it really is "G & P", but I wonder about the much plainer look.