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Hi Roger
As some GMB members know, we collect Arculus / Walsh Walsh pieces, mainly because Helen (my wife) was born Helen Arculus. We have a few small bottles like this, as well as some large ones (and various related millefiori objects like bowls, jugs, tumblers, shot glasses, wine glasses) - as well as a good selection of Arculus paperweights. These small bottles are not common, but they turn up from time to time.
I would agree that the small bottles are relatively rare. However, as Nick notes, this one has been damaged - so I don't think it is worth a lot. A decent condition one should cost you no more than £150.
Alan