I really enjoyed my Viewmaster as child, and actually I still do! For me it is sort of mystical the way it can totally immerse you with its visual magic. The Viewmaster company was formed by Harold Graves and William Gruber in 1939, and as the say, the rest is history. It is amazing that it has been around for so long. Twenty-five different models of viewers, and 1.5 billion disks have been manufactured. Despite its long history and the many changes in its models and materials, the same basic design of disks and internal mechanism has persisted throughout, ensuring that every disk ever made will work in every model ever produced. Now that is what I call backward-compatibility. Safe journeys to all the fans of Endyr's Toy Box, wherever you may be.