Just to add a note to Anita's comment. For the well known companies, i.e. the ones who produced glass worth a great deal and/or glass which is highly valued aesthetically, you'll find there are a few sources which give you an idea when a particular label for a company was made. Heiremanns in Themes and Variations, for example, gives a history of the labels for AVeM, Barbini, Barovier & Toso, Cappelin, Cenedese, Salviati, Seguso VA, Fratelli Toso, and Venini. I don't think anyone has done the research for the thousands of other labels that existed for a couple of reasons: first, it would be really difficult, as companies come and go without keeping records in the way that Venini does, for example; and, second, it doesn't really make difference when some pieces were made. I've got the label you mention on a few pieces, one piece pretty much basic tourist glass (an orange ewer), and another on a quite nice little fenicio jug. I know the latter piece is way better than the first piece, yet they both have the same label. That is, the label doesn't tell me much, I have to look at the piece of glass itself for that. I guess the basic question is whether you think your paperweight is well made.
Yet the labels that are in Heiremanns and elsewhere are useful in that they give you a ballpark figure for when a particular style of label was in vogue.
David