Topic: Half and half round bottom tumbler?

[Ekimp]

Hi, any ideas for this? Doesn’t seem very practical for a tumbler or vase due to the small area of the flat part of the base, perhaps it should sit in some sort of holder or is it just for show?

The clear glass at the top seems like any other clear class, then it meets the coloured glass which is about twice as thick, you can feel the ridge on the outside and inside surfaces.

There are horizontal striations a few bubbles. There is only light wear, I assume it must be very modern? 120mm high, 75mm diameter, no pontil mark.