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Hi. As Kevin notes, canes from some of the Murano factories have been sold worldwide - but also to other Murano factories, so it is difficult to tie paperweights to specific Muranp makers. Dating is perhaps less difficult, but still imprecise. And there are lots of them: after Chinese products, Murano is probably the most prolific source of paperweights in the world, with many million pieces in circulation. Trying to decide which factory made which piece is a real challenge!
Regarding your paperweight, the use of a few complex bundled canes in a 1 +6 pattern seemed to be common in the 1960s - 1980s. So that may be the era.
Alan