Reddit reviews Field Guide to Pattern Glass

It's pattern glass (commonly referred to as pressed glass) with cut-glass accents. I doubt they mean anything more than being a decorative element. Pattern glass was made for the masses, so there's a ton out there and figuring out the manufacturer can be tricky. A book like this helps.

Though the cut stars look really rough. I wonder if that might have been an apprentice piece or a cast-off that didn't get destroyed.