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Hi Nick.
I don't know of any 100% confirmed Pantin millefiori. I have seen suggestions of such pieces from Paul Dunlop, based on similarities between elements within the Pantin animal weights and canes in other weights with millefiori.
I believe that you should always keep an open mind about quotes from the 19th century which involve terms such as 'millefiori': exactly what did the person quoted think 'millefiori' meant? What it the same that we mean by it? We do not - and cannot - know....and plenty of people use it in rather loose ways nowadays. You only have to skim through eBay to see the term 'millefiori' misused in a number of ways.
That said, I would be surprised if Pantin had not attempted millefiori weights. All the 19th century factories were in it for the money, not for any other reason - they were not studio artists. If millefiori weights were selling, I bet they tried to make some. However, if theirs worked out too expensive to produce, or orders were not forthcoming, then they would have got on with more profitable activities.
Alan