Mine has 4 glow plugs and is grey and red... when it is not running or the wind is in a good direction. I have a feeling your tag was squished so's that it perhaps was??? SDM 211,6xx??? I believe that would be 1960 or 61? so a MF paint, Standard diesel with glow plugs would all come together to make a fine tractor like mi.... agh... Sam's one here in the picture.