I picked up this corn planter a couple years ago with a 1938 Shaw D5T. This planter was also sold as an attachment for Standard garden tractors as it is shown in some of their catalogs of the same vintage. There is a trace of light blue paint on one of the hopper covers. Does anyone know who the original manufacture was and what the original color may have been? This appears to be a very well made unit. Thanks for your help.