Hi Leni,
I actually looked at that site having seen it listed on the Great Glass website and it does state that it uses gold in their creations and there are gold inclusions in this paperweights. I have tried to telephone the company to find out if they ever made paperweights as their current gallery only shows large plate or sheet glass displays. Unfortunately to date I have only received answer phone replies. I will keep trying.
The signiture does look like it could be Greenhalgh although the last two letters/figures could be 97.
Thanks for your help,
Bryn