Simple handheld Brewster stereoscope, c.1890s. Light colored wood. Takes smaller stereoscope slides. Has a removable back (See images). Includes unusual blue steel hardware (possibly Martensite, which was developed at the end of the nineteenth century). Incredible craftsmanship on all sides. Sir David Brewster (1781-1868) was a Scottish physicist who invented the kaleidoscope and this reflected light lens stereoscope. He also discovered the polarization phenomenon of reflected light. This stereoscope is in very good condition. A number has been written on each part of this item, perhaps showing an early use of an assembly line to put this product together. It measures 4 1/8 H x 5 3/8 W x 5 3/4" D and weighs 12 1/2 oz.