I know via VIN the DSO was Indianapolis, but not sure the dealer. Confident that's where the trail will end but thought I'd ask.
Like DustoffMedic, I was fortunate enough to find the original owners manual in the glove box of my '66 GT. Douglas Simms (son of the original owner) found a post here on VMF regarding my manual and contacted me in a PM. I found that the car was originally purchased as a 16th birthday gift for his sister, Dawn Marie. He also told me that the car was later given to the son of a longtime friend, Eddie Arcaro. Arcaro is considered probably the greatest jockey of all time. He is the only jockey to ever win the Triple Crown, twice. The second win was aboard Citation. It was Arcaro's son who returned the car to California from Las Vegas.When I got Diane, my 65, the original manual was in the glove box and the owner's name, address and all the vin info was typed in the inside cover by the dealer. I consider it a great treasure find.
All my years in the car biz were in North Carolina and every time a car was traded in without a title we ran a title search through some gov't office in Raleigh. I just assumed it was like that in every state, I guess not.At one time I bought a car without a title. Part of the procedure to get a new title was to do a "title search" through the North Carolina DMV. Done for me by a registered dealer, I don't know if average Joe can do so. Point being that the results we ended up with were a name by name trail all the way back the original dealership that sold the car. Which I thought was pretty neat bonus info.
Apparently procedure and ability to do such things varies wildly by state. Doesn't hurt to ask though.
I don't think you have to be a dork to run a period correct Dealer LP frame. I am considering one that I found online. Just not sure if it would look strange having a Las Vegas frame with California plates.And once you find the original dealer, if you're a dork like me you buy the dealer licence plate frame.