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I was looking forward to GOOGLING GOGGLES...
"S in a circle" is the monogram of Safeway Foods. Maybe they owned them for employee use?
I googled the date, and name "I-Safe" for patents and several patents came up but without the date included. I found some brand new similar safety glasses that retail for under $10.00 USD.
I think they look much older than anything in the past 20 years or more...
I would guess 1930-1940s and they are cool. The prices are all over the place, but $50-$150 seems more accurate from my observation. Keep looking!
They are definitely cool !
Thanks for your input!