apologies - I'd overlooked your comment re 'sharp pontils' - in which case my comments about looking at Replacements.com are almost certainly wrong - surprised no one picked me up on that.
Your bowls might possibly almost verge on being barrel shape, which C19 not C20. Slice cutting also very common at varying times, and some distinctive features were copied and reproduced over long period of time, making life difficult for collectors.
Drinking glasses were produced in such vast quantities, not easy in many cases to be sure of period of manufacture - but these are attractive and usable. The sharp scar under the foot is not a tell tale sign of being from the C18, unfortunately, it's a feature found at odd times throughout much of the C19 too.
You may not progress much further with these than saying 'middle third of C19' - but let's hope someone can prove me wrong.
