It's an old metal Flake red. From what I can tell it's not candy or pearl- it's metal flake ( ground aluminum). The best example is on the Larry Watson car below. GM also made a Sunfire Red Poly for Pontiacs in '64, while Buick had a Coral Mist Poly ( both were close, but the metallic was fine instead of co****). The trick is actually finding a paint store which can reproduce it. None of the paint stores around here cater to hobbyists anymore and even if they do, all they have is modern basecoats and they aren't ready to 'experiment" with reds in the $500-$1200/gallon range. I'm curious if things might be different somewhere else....
Might be a 68 Vette Bronze that someone incorporated lighter red with flake. Or a tangerine base with some red layover with flake.
Just take it to the auto paint supply and have them do a color spectra on it. Most of the time it comes up pretty damn close.
trying to match paint colors to 60 year old pictures is impossible. The Starbird ultra truck (the middle one) was orange. It was orange with silver pearl over it. And please don't post pictures of cars newer than 65....