Vtg Eyeglasses American Optical 1/10 12K GF MOP Pads Antique Bi-Focal Safety

Very old example of ao (american optical) safety glasses with clear & bifocal type magnifying lens in lower portion, 12k gf metal frame and what looks like mother of pearl pads. includes case. glass is in good condition, some of the gold appears to have flaked off and the hinges are loose but can probably tighten up by tightening screws. ao symbol on left (photograph #3 and another makers mark to the right side of nose bridge. any information is appreciated! two shipping options.