One of the earliest models of popcorn poppers from Manley is what many people refer to as the 1939 model (probably the year of design).  It would have been a common model for the early 1940s until it was replaced by the early Premier and M-Line models.  This Manley model is easily identified by the top side-view that resembles a cross-section of an aircraft wing.  The 1939 model has the motor mounted on the kettle in a fashion similar to the Burch models.  The Premier and M-Line models introduced the flex-drive cable to power the kettle's agitator. 

Photos Courtesy of Art