These glasses are the real deal they are right about the old workshop with decades of grease and dust on them. The outer shell is rust-coloured plastic resistant with black marbling throughout and three flashes in relief on the sides. I think this plastic is made of Bakelite. The screwed-up eyepieces on and off to fix the two pieces of glass layers between the two is tinted, the other is clear.
Goggles can be worn with one or two pieces of glass. The tip is made from a small segment of the ball chain and covered in a rubber like a tube. An adjustable elastic strap goes around the back of your head and attaches to each side of the glasses. Vitals: eye - 2.25 in diameter, outside the depth of the eyepiece-2.
Elastic bracelet - ideally should be replaced with a new elastic (I'm happy to do it for you if you wish). Donkey just got his hands on everything - he likes to be in the mix of this guy can look like a donkey in these glasses, (because he is), but you surely won't be pure vintage of any way you look at him, these glasses are a wonderful find. The same type of glasses, men wore while driving cats (catepillar tractors) in the 1940 film the grapes of anger with henry fonda.