This is an original authentic VIEW-MASTER Stereoscope, Model G from the early 1960's, produced and sold by Mattel. Originally produced in 1939 to rival 3-D post cards and first introduced at he 1939 New York World's Fair. A favorirte toy for kids and adults for more than 50 years. This unit is still in perfect working order. Reel sets include the Civil War Battlefields, the White House Tour, Wonders of the Deep (ocean tour), Marineland of Florida, South Carolina tour, the Easter Story, and The Animal World (dinosaurs).