Thank you for the information. I am happy that my dad bought the Mercedes new and he was the only owner. However, It seems that back in 1962 (when the car was bought), NJ must have issued a separate 6 digit serial number to each owner on their Certificate of Ownership. I can't find this number on the car anywhere, yet this number was used with the registration and insurance cards. There might have been some mistake along the way with paperwork? Still hitting one road block after another. Not sure exactly where to go from here, but there has to be an answer somewhere.