This charming box with six Bakelite frames was recently given to me by a friend of my parents.
She had inherited them from her uncle, who was an optician, and she thought it most likely that they were from the 30's-40's.

While not in the best shape anymore, they are all quite wonky, one is missing an arm and the 3rd one from the top in the picture above seems to have warped completely.
I might still try to get one of them back in shape and fitted with prescription lenses.
The remaining ones will make for a very charming little collection.