Hi Laura,
The Italian label was identical to the other FBS marks, I misplaced the image though. Have been hunting this one for years and everything points to it being a US/Canada origin. In most cases it included the country of origin alongside the mark, there is a slight chance that the Y shape is actually a Y.
The only consistency is that the method of applying seems consistent, Moncrieff was always acid etched and another French example was reported to me matching the one shown above. That implies that the mark was requested as part of the order.
Most of the Monart examples, at least a dozen reported, have turned up in the US and the mark was always been on pieces with the export mark as above. Export marked Monart has also been found in Canada, New Zealand and Australia.