OP's Puzzle #1621 - 1916 McKeen United Gasoline Highway Coach

[Otto Puzzell]

Know what it is?

Please, respond below and identify what this is, and who built it.
As always, detailed answers are greatly appreciated by all. 
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Thanks!

[Otto Puzzell]

Don't forget me, rookies...

[Otto Puzzell]

Get on the bus, Gus! ( Gus is an expert, isn't he?  )

[Otto Puzzell]

Where have all the experts gone?

Doo-doo, da doo-doo, da doo-doo, da doo-doo

[Ray B.]

Any connection with McKeen ?

[Otto Puzzell]

Don't have the answer with me - will respond soon.

[Otto Puzzell]

Though my reply was not soon, I'm pleased to say you are correct, and award you the point.

I don't have much info other than that (1916 McKeen United Gasoline Highway Coach)

[Ray B.]

Thanks! I hadn't found your exact source, nor the car yet, but had seen a site about McKeen's cars and those typically round windows...