Probably mostly down to me, really.
While looking for better quality Ysart canes [assumed by many folk to be Salvador's personal stock] in weights from Ysart Bros, Vasart Ltd and Strathearn weights, I began to notice some that had definitely been found in Paul's weights and some of those weights certainly apeared to be 1930s items. A "famous" example in this category is one of three versions of Butterfly cane that is seen in the "Vincent set" [formerly Salvador's stock] and is also known in early weights by Paul.
This would suggest that at least some of the "Salvador" canes [the better ones seen in Vasart etc. work] were in fact made in the 1930s. One conclusion [but not proven, of course] is that when Salvador, Vincent and Augustine formed Ysart Brothers Glass, they took with them a stock of existing canes.
If this was true, then we have to consider whether Salvador made many of those canes ... and Paul just happened to also use some. Or perhaps Paul made the canes and in 1946 Salvador just said, "I'm taking a load of those." Or were the canes a truly shared resource made by any of the family?
Whatever the scenario, I can't help thinking that Salvador made a range milleifiori weights (but nowhere near Paul's numbers) in the pre-war years.
Also, I have seen "Salvador" weights [pre-1956 by UV tests] that have been finshed very well. That is, the bases have been ground and polished with some showing a quite deep, and very tidy, concavity. Although these well-finished items may have been made post-war, they could just as easily be earlier.
So, with my customary caution, I began to say things like, "I think it's early Vasart and most likely by Salvador ... but it could be 1930s period". Of course, I could be completely wrong. It will be interesting to see if sellers (particularly on eBay) start to say "... could be 1930s ...". I have noted an incease in descriptions saying, "Ysart Brothers Paperweight", and I think that is a good thing as in the majority of those cases I think they are correct.
Hmmm ... it's still all supposition and there is still too little evidence to draw any decent conslusions from. Even UV tests do not, in my view, help to show differences in pre- and post-war weights.
Is it just my ramblings, or are there other folk who are suggesting 1930s Salvador milleifiori weights?