Loupe - 1870_ 1900 - Grafoscope fine 800

This instrument seems to be a graphoscope (or graphoscope), an optical device from the era used between the end of the 19th century and the beginning of the 20th century. The graphoscope is essentially a magnifying lens mounted in a wooden frame that allowed viewing photographs, postcards, or engravings with greater depth and detail. Often these objects had a foldable structure that allowed adjusting the angle for an optimal viewing.