paperweight makers are in the 1000's. I have lists of several hundred that do not include any of the major factories. and there are many factories that made them as well. Many were never signed and the signature canes were only used by a few that had the capacity to make good murine cane. Lampworkers have exploded over the last 60 years and there are many. Studios have opened and closed like people changing their socks. I know of a few hundred different individuals who have taken classes at my studio that made paperweights and signed them. IN the US there are 100's of little studios and who knows how many have worked for these and made paperweights. '
Needless to say, some are quality and some are not so quality.
I have a list of several hundred from the US that I put together for a presentation I gave to the Indiana paperweight collector's Assoc. last April. It, by no means, even scratches the surface of what has been produced. Documenting even just your own collection, if it is very big, is an endless labor of love.
This same things holds true for art glass marbles as well.