Hi TC - a polished (ground) rim would be most unusual for Carnival, but I have seen some pieces that have it, such as the Jain tumblers from India.
A fire polished rim, on the other hand, is more normal for Carnival.
TC...you had a celeste blue Vintage? Had? Past tense? I hope you sold it for MUCHO cash!!
You mentioned the sharp edges - that it absolutely typical of celeste blue Carnival.
PS And thanks Lynne and TC too, for your kindness too.