Hi, all--
I agree that Du Pont 60659 is a good match for "Molteni orange" (I believe it's what Joe Bell uses). However, I've had some original paint jobs in my shop and throught that Du Pont 31 was closer. I've always supposed that all these orange frames may have been painted different places, and that the color would vary a little. In addition, it's important to realize that most of the paints from that era probably changed with time; I've seen this when the clips and clamps have been removed.
Chris Kvale
Minneapolis, Minnesota