I need help identifying these glasses. Guessing from the collection of old electronics they came from I'm guessing their from 1975-1995. There are no model numbers on them at all. Only the Made in China on the inside brim and "3D TV Liquid Crystal Glasses" written on outside. When you wear them they make LCD monitors turn dark to black at the right angle. And its only LCD's that change color, everything else is the same. The connector coming from it looks like a 1/4 mini jack.