I want to give a big shout out to Danielle at Stellantis for sending the build records for my two Plymouths. It only took a few weeks to receive them, much faster than originally estimated. It's nice to have more background information for both the '51 business coupe and the '52 Cambridge. The build dates and key codes are good to have on-file.
I bought the Cambridge on Staten Island, NY and the original selling dealer was located there, so no big surprise. I got the business coupe on Long Island and the original selling dealer was in Detroit. The car moved around quite a bit!
If you haven't done so, it might be worthwhile to contact Stellantis and see if they have any info on your car.