Unknown Mystery Speedster Giant Roadster Amateur Race Car Driver

Any Guess as to the Original Maker of this Brute? circa 1918 Missouri license plate & St Louis tag My first guess was Oldsmobile

1917 Stutz Bearcat or Mercer Roadster S05357

1917 Montana License Plate

Note 1917 Montana License Plate on Spare Tires
Photos are stamped Billings Montana
Handwritten note on back “500 Miles from Home”