Allan - the top center of Bob Hall's has canes that i've seen more and more of the last few years on eBay.
Especially French ebay where they get listed a dozen at a time.
See eBay id 170467474807 for an auction of a similar weight. The seller has six listed with no signature canes etc.
The listing says "original murano glass" but does not specify maker.
It is telling that the listing says "The picture is indicative, the glass is hand made and some time can be little different."
My vote is very recent Chinese.
Given that there is supposed to be a signature cane in the one in Hall's picture, and the somewhat better than usual setup,
it is not impossible I gues for that piece to have been assembled by Benetti using Chinese canes.
Over all tho I think the biggest problem with Muranese paperweights is that canes are sold wholesale
to anyone who'll pay. So even genuine Murano canes can appear in Chinese weights, and Chinese canes in genuine Murano weights.
Add to that the various other scams Alan mentioned.