Hi Kev / Andy
Thanks for your helpful comments - I have no illusions about this being a simple exercise. I see three distinct elements for someone looking to attribute a paperweight to Murano: first, identifying it as a generic Murano piece; second, estimating the date it was made; and third, attributing it to a specific maker. And I think there are some other pitfalls for the unwary as well as the important matter of there being few cane makers but many paperweight makers on Murano.
First, paperweight makers outside Murano have used Murano canes at times - for example, Liskeard Glass, Royal Brierly, I think Jim Hart has used Murano canes at times (?), maybe also Langham Glass (?) - forum members probably know better than I do. So identifying a Murano cane in a paperweight does not guarantee it came from Murano, let alone which factory. (The 'false friend' problem).
Second, neither a Murano label nor the fact the paperweight was bought in Murano guarantees that it was made there. Significant numbers of Chinese weights have been sold in Murano / Burano / Venice in the last few years, some bearing Murano labels. (The 'grey import' problem).
But because something is complex and difficult does not mean it should not be attempted.
Alan