This folding pocket stereo viewer was made in the USAc by Hubbard Scientific Company.
It offers high-quality lenses for superb stereo viewing.
The distance between the lenses can be altered easily, from 60 to 70 mm.
The viewer can not be used for stereoview cards, but smaller parallel stereo photo's, like in books or accordingly sized on a computer screen.
Really nice and handy viewer to have on you always.
Mint condition, new old stock.