Is there any doubt whatsoever that this is a Chinese weight? That said, I would have dated it to pre-1950.
I recall a Newspaper article a year or so ago which recounted how some people in Murano were arrested for fraud, and over 13 million (yes, 13 million) glass items of Chinese manufacture were impounded from a warehouse. They had been labelling these and selling them as Murano. The problem, as I understand it, is that under EU rules you can import something into Murano for, say, 1 unit of currency; do work of value 1.1 unit of currency (eg sticking a label on and putting it in a box); and then label it quite legally as Made in Murano.
If you search Chinese glass makers websites (I keep putting links on GMB for these) you can find lots of 'Murano Glass' items advertised exactly as that - including paperweights amongst the products, some of which turn up for sale in Murano, others on US eBay and French eBay, sold as 'from Murano, hand made in Italy'. Hmmm...