The Marmon Club prints an annual registry that includes all known chassis numbers and their last known owner. As a side note, I have a friend who's granddad was Chief engineer of Marmon from 1927-1929. He formerly was the Chief Engineer at Lincoln. However in 1927 he was elected president of the SAE. Henry Ford didn't like that too much and called him into his office. The quote goes something like this " I understand you have two jobs now, which one do you want to keep?".