555: AMERICAN MOTOR (2)
The American Motor Car Company was a short-lived company in the automotive industry founded in 1906, lasting until 1913. It was based in Indianapolis, Indiana, United States. The American Motor Car Company pioneered the "underslung" design.
There was another one prior to this in 1902-1903 - but as it's your 2nd entry, hopefully you wanted the Indianapolis-based company.
My next one would be 5611. thanks