Thought I'd update this thread, since I got the paint color I decided on from here (
splib,
Jul 24, 2012 post #13)
Well, the results are in from my paint search. I took this picture the same day the samples were mixed, in direct sunlight so as to be most representative of the relative differences.
The hinge is from my '73 FJ40 rear hatch, hidden from sunlight for most of its 42 year life. The swatch next to it is R-M file color for 808 Horizontal Blue. Given the aged paint vs. the new paint sample, I'm certain my '73 is originally horizontal blue.
The upper right is Blue Gleam 1749, represented as an official Toyota color for the 1973 time frame. My FJ40 is definitely not that color.
The bottom right is a standard R-M color, "SB015.00", which was posted by splib as noted above. It's clearly a contender for Capri Blue 310.
While not officially "Capri Blue", it is definitely has more of a gray tinge than the horizontal blue.
Apparently, even having original formulations for paint colors from 40 years ago doesn't mean they'll be 'on file' with current paint manufacturers for their entire range of paint qualities. Blue Gleam was available in various grades of paint, Horizontal Blue only in the econo line of R-M paint, while the SB015.00 was available in the mid- to high-grade products.
I'll be using the SB015.00 in a single stage urethane, no clear-coat. Multiple coats, wet sand out any orange peel, easy to maintain.