No. 4052 (Model 6)

Image Courtesy of Grant Kornberg, Technogallerie

Image Courtesy of Grant Kornberg, Technogallerie

Image Courtesy of Grant Kornberg, Technogallerie

Image Courtesy of Grant Kornberg, Technogallerie

Type 4052 Model 6 | Phil's Collection

Image Courtesy of John Jenkins | Visit the SparkMuseum!