I've added a couple of pieces to my 20's and 30's collection and this was one of them. Very iridescent/glossy and a nightmare to photograph. Flash on a dark background seemed to work best.
The millefiori are all round the lid and base. I think this must have been quite difficult to make. It has a white interior, then the millefiori layer which is quite thick on the lid but thinner on the base strangely, then cased in a caramel layer and iridised. I'll add some more pictures once my battery is charged.