First pair: GU 427 %26CL GUN 48/20 143
second pair: MOD 306 53/19/140 SBWN
They may not even have any meaning, but Im just curious.
Answer:
Manufacturer, model number, and possibly size or number of the lens blank it takes. Might also have the length of the temple bar.
what model=where they were made and by whom
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