Off the car - showing a DUP 351 sequence
Stickers show a JAN and a 1966 which would be incorrect IMHO for 66 in California
As a side note - another example of paint marks gone bad. Please, no one here, copy the paint marks from the pictures in this ad
Cool paperwork - not sure why the life insurance got included though
Regarding the month JAN for 1966 would be incorrect for sure, however, I bet if the month sticker was peeled off, the registration sticker underneath would be 1973. I believe California started having everyone attach the Month sticker in 1975.
The DUP 351 plate looks like it has at least two registration stickers under the '66 registration sticker.
I wish I could confirm this but I had hypothesized sets of license plates were issued to each county. I had noted a lot of HOG series license plates in Ventura county. My parent's '65 Ranch Wagon (Galaxie) wagon was one of them and it was a late (July?) '65 vehicle built in Los Angeles (I think).