Vintage Safety Goggles Glasses Sunglasses Folding Mesh Sides Steampunk

In vintage condition. They may be antique but I’m not sure how to date them so calling them vintage. Lenses are tinted amber and have scratches. The frames have lots of patina and the arms lay open completely flat. The mesh has patina, wrinkles, dents or are bent. On the inside of the bridge it says something but it’s been worn down. Possibly S.P.A. or S.F.A. or the A could be an R, really unsure what it said. For a complete description please be sure to view pictures.

Measures approximately 4.5” from hinge to hinge on front of glasses.