Hello and welcome to the board
In order to help identify your glass we would need to see
- a pic of the whole piece side on and very clear against a white background if possible
- a clear picture of the whole base
- any further pics of identifying marks on the piece
and we would normally need a description of the piece including how the rim was finished and the size and weight of the piece.
It is unusual for values to be discussed on the board I'm afraid as they can go up as well as down depending on demand at the time
I'm looking forward to seeing pictures of your glass.