Snapshot Photos of Mystery Speedster w/ Big Motor old car identification needed

Vintage Snapshot Photo Pretty Girls w/ Mystery Speedster circa 1920s

What is it?

Ed Iskenderian of Isky Racing Cams Fame in 1927 Model T Ford Hot Rod

This is a Auto Show Promo handout photo from 1950s-1960s note date on photo of 1938-39 build date for this early Hot Rod

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

1936 Auburn Boat Tail Speedster W02389

This photo is marked stock number 170734 on the back. It is from the
“Photographs of the Worlds Finest Automobiles” collection
by The International Automobile Photos Co. of Minneapolis, Minnesota circa 1950′s.