Thanks Alan, much appreciated.
I have to say this is unlike any other weight I have handled and nothing like the scramble weights that I see occasionally on my travels. The colours are not bright like those of the 50s and beyond. It has the feel of age, the dome is uneven and pockmarked, bubbles, frit and ash abound and the glass has a slight grey tint. Contrasting with the colours the aventurine is bright and fine.
This weight came from an auction, there was another there that looked to have Fratelli Toso canes dating from around 1910 in it but it was badly damaged.