Thanks very much Ross,
It certainly does look like SW with a curl on the W....Wow what a collection you must have !... I'm starting to collect paperweights myself...Millefiori Murano from the 1970's mainly. At least with canes there is a chance of a strong ID. With bubbles and swirls it's a different story even with initials !
I really do have the paperweight bug though...a very addictive interest !