I had not considered Empoli for these before but that region does seem to be a strong possibility (I have no other reasonable suggestion).
I think Nic is not claiming that the jug shown has the same bobbles - he has provided an image of a known bit of glass from Empoli. He did say that he had a few in the past which were similar though. Plenty of similarities - thin walled, white glass cased with a colour, cheerful 'pop art' design, etc.
We need to find one with a label.... :X:
John