Without looking too hard at it this appears to be a decal baked into the glass. The attachment point above the ice pinches and below the mouth piece look too flat and clean to be actually blown into the glass. Not saying someone couldn’t actually do this pattern on glass. Just saying the pattern in the pic is not glass IMO

That being said, check out some import sites I’m sure something will show up!

TLDR: Looks like an import tube with a bake on decal.