FM3 names?

It must have been a late in the year color. The Plymouth chip chart doesn't list it. The Dodge specific chart does. The 1970 Hamtramck Registry - 1970 Paint Chip Charts Slideshow
Believe it or not, you could get FM3 on a C-body in 70. (Pretty sure anyway, lol). I've seen one, whether it was original, I couldn't say.
I have no idea what Chrysler called that color. I'd be willing to bet it was special order only.