Tom—thanks for the link, I found that, too, also this one
http://www.chassis-plans.com/paint_fed-std-595.html which shows the color chip, albeit in RGB.
and this one:
http://www.jpsmodell.de/dc/usass_e.htmThe color name does vary with the source, but what confuses me is that Dana Bell, for example, refers to this specific number as being the closest match, but it isn't in the current FS 595B. He does refer to 595A, but I cannot find that, anywhere. You'd think that a color, once in the standard, would not be dropped—it's not the bureaucratic way!