Perhaps I am overly cautious, picky, negative but I do not believe 90+% of "early" / 19th century claims in this style of Venetian glass..
I am hard put to find or think of any quality Murano where powers or frits are used to colour pieces with the exception the very fine, subtle and scarce polveri pieces, of which this does not belong. I would be happily proved wrong with some reliably attributed examples. I am not including gold, sliver, mica and adventurine inclusions which are of course quite common, nor granizioli where the frits are largely external.
Here the frits are sparse, uneven, multi coloured and not well marvered in. It looks sloppy to my eye.
It should weigh less than half that for early production.