I seem to have a different experience than what several others are claiming is correct. I have a 1952 3100 that was manufactured in Oakland California. It has never been out of California. It has the original door pillar tag with the engine number as ID. It matched the engine in the truck and the title (aka pink slip in CA ) when I purchased the truck. I purchased the truck from the second owner and she purchased it from her neighbor. The tag had never been changed.
How did you know your truck was produced in Oakland if the door tag had the engine number on it? Are you saying it had the correct door tag with the correct body number plus the engine number?
My 53 is an oakland built truck and it has the original body tag with the correct body number. Never seen a body tag with an engine number on it. Would you be willing to post a picture? Would like to see if it had the correct mounts and stamping?