Take into account the 3/19 stamp, I believe the 621 makes more sense ( MAR 69 NOR #s: 607165-623587 ) but I guess 4 is possible. Have more photos from multiple angles and feel confident in 1. If we can just reach the guy w the 621880 car, that owner can decide what he wants to do. If he doesn’t, i’ve will rest easy that I tried and look for someone who needs it for a date correct application. I’m just trying to preserve an iconic piece of history in the right way. Got no other motives.