The View-Master Model C was produced from 1946 - 1955. This is a later one, probably made around 1950. Original retail price was around $2.00. This type of stereoscope was originally sold in photography shops and scenic attraction gift shops.
Not really a camera but optical in nature, the stereoscope is an instrument used for viewing two photographs of the same object taken at slightly different angles. This creates an image of depth and solidity that is intriguing.