Thanks for the comments Frank, Rosie and Rose.
Rose - I really don't think it has ever been in a pot - just wouldn't be balanced properly. I have seen lots of those little trees in pots but this one is much more substantial than those.
Rosie, thanks, the link you sent is very similar - base is identical in shape and the way it is made - leaves and fruit and trunk also very similar. I have emailed the seller to see if they know anything about age and to ask for a view of the label.
Frank - I would be interested to know what differences you see between the one in Rosie's link and mine? Cannot tell of course whether that one is stained or coloured glass. And I think you are spot on with the home lampworker idea. Amazing to think someone made each separate leaf and shaped it individually !
Still curious as to what it is for ? A table centrepiece perhaps? or just an ornament? I can see me putting it on the Christmas table with my green stemmed wine glasses
Thanks everyone for your interest . JAK