Hi,
Thanks for your replies.
Yes, apologies, I meant a scar from the pontil (trying to learn the technical vocabulary).
It would be a very small mortar.
The whole glass is one piece, including the stem and foot. It's all glass. Looking at the photos, I know it looks like alabaster or another stone but that's a trick of the light. A lot of that is dirt. There is however that darker stain there.
I might try taking another photo tomorrow with different/better light.
Thanks again,