Don´t worrée, m, perhaps someone will jump in...
Sue, the texture feels slightly rough. Perhaps like you describe the WF glacier; only perhaps though because
I´ve never handled one. The tiny shards (I´d call them rather than frits) are fire-polished just to the point
they aren´t sharp enough any more to get hurt.
The base may have been stuck to a pontil rod. Possibly just because I expect to see them some of the small
shards seem to have a slight angle like from grinding and polishing. In case it´s not just imagination it´s been
done in a very skilled way without disturbing the overshot effect. :-/