I don't like to be the little cloud over the head of people, but has the paperweight been documented or authenticated? The sig is very different than the ones used on his later designs. Chihuly lost his eye in an accident in 1976, if online bios are correct. Maybe you could write to them and see if the paperweight is one of his designs. It would be nice to know for sure if he designed any paperweights. Perhaps they were pieces of some of his installations??