The frames are the classic Yeoman 48-22 matte finished aluminum. The optics have a 13 working distance and 3.5x magnification. These were custom made and have a prescription upper lens so unless you got really lucky you would need to replace the lenses only.
The frames are engraved on the arm with the doctors name. Fresh out of a recent old estate. The item "DESIGNS FOR VISION INC DENTAL DENTIST LOUPES 3.5 SCOPE 13 YEOMAN GLASSES" is in sale since Sunday, October 02, 2016. This item is in the category "Business & Industrial\Healthcare, Lab & Life Science\Dental Equipment\Dental Lab\Dental Lab Equipment". The seller is "two-cool-dudes" and is located in San Diego, California. This item can be shipped worldwide.