Pictures attached of what I believe to be a Sunderland Glass paperweight.
It's smooth bottomed and signed SGL and 'Selene' with also '99' (or 66 if you stand on your head!). So similar to the weights on ebay.
I've seen other Sunderland paperweights, all of an abstract design, but 'proper' paperweight shaped. I've not seen the design now on ebay.
Mine has remote echoes of an Ysart single harlequin in style.