This is the OptiVISOR LX-7 Optical Acrylic Lens Binocular Magnifier by Donegan Optical Company.
Great for close-up viewing! OptiVISOR LX lenses are lightweight and manufactured to precision prismatic opthalmic standards The frame is made of lightweight, durable impact resistant materials.
The comfortable, continuous leather headband is fully adjustable to fit any head size, quickly and easily! Adjustable pivot knobs hold visor in any position for easy flip-up viewing.
Can be worn over prescription of safety eyeglasses Ideal for jewelers, hobbies, tool & die makers, engravers, needle point, cross-stitching or sewing, draftsmen, artists, architects, reading small print, physicians or dentists Instructions included.
I used these OptiVisors for a couple decades or so when I made police and fire department badges. They work excellent and leave your hands free to work unlike a standard loupe. If you need to see details more clearly, these are your tool.