This Vistar Semi Automatic 33MM Viewer with Panoramic Lens is a must-have for collectors of stereoview and stereoscope items. This original, new in box item was produced in the 1950s by View-Master and comes with three adventure time and picture viewing subjects. Made of plastic and featuring black and white images, this viewer is a great addition to any collection. Its production technique is unknown, but it has a time period manufactured between 1950-1959.