Antique Mickey Mouse Fire Truck Sun Rubber authentic Co

This is a Sun Rubber Mickey Mouse Fire Truck. The truck is labeled as "Mickey Mouse" and has Mickey Mouse Feet next to the steering wheel. From what I have been able to find out about this is it is a factory error. The Driver is supposed to be a Mickey Mouse head with Donald in the back. The reason is believe it is an error is due to the numerous other trucks that have Mickey in the driver seat. There are only a few of these with the Donald heads. Also, I cannot locate any catalogs or articles that show this with Donald as the driver. I have included a detailed photo of the connection for Donald's head, There does not seem to be any tampering or signs of repair to this. This is in fair condition, The entire body is complete with the tires as well. authentic