Sorry to be so behind the times - I do not have time to regularly check the board. Usually leni chivvies me into replying!
I would have said that this paperweight was made in the last 5 years. The square weights ( made in the sandwiched together way) have really only come into fashion in that time. Domaghi were the first ones that I saw like that. Ragazzi make square ones too now, but not in the same way. That paper label is the same as the one used by Eugnio Ferro - although I know that is not a guarantee that they made it. Last time I looked round the stockroom in Eugenio Ferro a few years ago they were making square and cube fish weights - but I could not find any that I thought the quality was good enough to buy for resale.
When you say you were given ID on the weight - in what form etc?