Somebody post a picture of the bottom of a glass item where you can see deep striations like this...
Grinding bases can be done very quickly with a coarse wheel and a narrower one will cause less friction heat but more nooticeable striations. Often this would be followed with a finer wheel to smooth to a matt finish - which takes longer. Finally it could be polished completely.
The extent of finishing can indicate: a second if a known factory usually polishes, low budget for the gift trade, a small outfit where finishing varied with time available. As an identification guide it is less useful as most glassworks would vary there finishes for all sorts of reasons.