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Hi. You will find many dates in Murano paperweights, from 1815 onwards. I have seen it suggested that they are to commemorate important events in Italian history, but some dates do not seem to correspond to anything important. It could be that, like the Baccarat Dupont dated weights, you could order specific dates from the factories to commemorate anniversaries etc. I think most of the dated Murano paperweights were made in the second half of the 20th century. Your '1956' weight might be from 1956: they made some dated 'London 1951' for the Festival of Britain.
Alan