Thanks for that Ad deejay..It does prove all 3 were released together,but what is doesnt show is the base clearly...This is what we are after...A model 4 base in an original ad with a SPECIAL badge. This would clarify its existence.
And Jonesy, My Appologies,as I may have misunderstood you?. The model 5 S1 pictured at the Powerhouse would not have had any model 4 parts as it came directly after the Automatic and Model 4. They are in no way related as their bases are different.
The base that would have come with leftover parts would have been the model 4 or Chassis 4) The same base style of the Automatic,that was continued on after The Autos Run ended. A Plain,Stripped or waterd down Automatic is the best way to describe it Hope this makes more sense?
This would clarify its existence. 
