Hi,
Do you think it might be Royal Doulton - just a wild guess, but it does have the colour indigo,
which RD appear to have sometimes used.
I’m also pretty sure the glass is crystal.
Don’t know whether RD pieces have polished pontil marks though- I’ve been unable to find much
info on their ‘ Art Glass ‘ range - a few examples on ‘images ‘ online, but that’s about it.
Scott