Autochrome rare slide viewer 9x12 manufactured in fine wood with great focusable magnifying glass built and luminous background. Polished hardwood in perfect condition, everything else in good condition. Autochrome Viewer Mackenstein:"" Le Pantochrome"" . Also it appears in the catalog of Mattey: Described as a monocular visor having a convex lens focus and a frosted glass screen 45 ° which gives great luminosity to the autochromes placed on a slide switcher to view portrait and landscape. An exceptional piece of impressive size. 2 portaplacas self-made for vertical and horizontal format are included.