Is it glass? The base (and in particular the glided numeral, which normally indicates the gilder) looks like ceramic - but the rest of it looks as if it might be glass. The bit that might be a pontil mark looks as if it's been glazed over...
very confusing!
Now I am not so sure it is!
I am able to insert my index finger down to the sharp crease near the bottom of the base.
It is absolutely smooth at every turn inside.
The interior is a near transparent blue over the white, all the way into the base,
except for an area just inside the hole, as if there was a dowel of sorts were there when the blue was applied.
The inside of the pontil is a raised point.
I don't know for sure, but it still feels like glass to me.
Here are a couple moor pics of the pontil area, one showing a toothpick inserted in to a void.
Dan