OK split this discussion from the earlier one that was more about a specific car and example
This is interesting to me, as my car is a Oct 64 SJ car as well. My under car primer is red. Also interesting to see the pinch weld black out, as I need to replicate on my car soon...
Though your car has a door tag showing an October date it could have been built before October or early in the month before the change - assuming that its an unrestored car
Remember that the door tag date is just a guess
Pinch weld and overspray from that application would be the same any other San Jose car. Will try and post a few shots
also is the horn bracket natural or black? I did mine natural originally but most i see are black...
Have a picture? Guessing that you have two horns and they are mounted on the radiator support like others from that period. Bracket would be pait of the horn which was painted as a unit