Identify this makers mark for Crystal stemware - Zweisel

can anyone identify this makers mark on crystal stemware?  I believe they are probably from the 50’s-60’s era.  I’ve searched 2 triangles between half circles but find nothing.

Helps to know where you're located so we know where to start the search

I found one similar to this on Ebay. It was identified as Schott Zwiesel but I could not find another instance anywhere else.
https://www.ebay.com/itm/304814559369
It is Ebay, so the link is destined to fail. Here’s a screen shot:

i think it is Zwiesel glass as the logo on your glasses looks very similar to this one


what i know for sure it is that your glasses are not hand made but pressed. The two symmetrical lines on one side and the other on the bottom indicate that the glasses were produced in the press.

It's one of those reversed marks that has to be viewed through the glass,
then it is the correct way round.

Thank you all very much!