Hi everyone. Thanks for the replies. I did think Walsh when I first started researching but all the glasses with this type of bowl I've come across by them seem to have more elongated bowls. I've looked for makers marks but found nothing. Both the cutting and engraving are well executed, the whole seems a quality piece made with clear lead crystal. The foot is conical and is finished slightly concave beneath the stem but its not a ground and polished out pontil.
There is some wear present but not enough I think to make it 19th Century or early 20th. Although it may have sat unused at the back of a cupboard for the last 70 years!
The stem is what really intrigues me, if you could cut and paste it to an18th Century bowl and foot it would look perfect! Most modern air twists have a small number of strands coiled around the centre of the stem.
I enjoy hunting for such treasures but it can be frustrating trying to Id them. And I never even thought to ask the lady who sold it to me if she knew any thing about it. We live and learn, well some times!
Cheers all for suggestions, will keep digging,
Keith