I am not sure of the exact period of them. All I know is there are before 1930 since they have a fixed bridge that rests directly on the face and the wrap around arms(you know, the ones that wrap around the ear.) I had them fitted with my prescription and BAM! I have a wearable pair of antique glasses.
The cool thing is they are exactly like my Great Grampa Otto's(yes, being super German runs in the family.)
