Do my eyes fail me? I looked at Slimsgt's
http://www.teglerizer.com/triumphcolors/index.html link which shows a photo of a car in every color. There I find a photo of a Spitfire in #64 Mimosa, looking very much like the color on my GT-6. If I look at any of the color chart links including Herald948's, and this one:
http://www.tcpglobal.com/autocolorlibrary/Which seems to be very complete, the chip for #64 Mimosa appears to be much darker / mustard colored. Maybe I am wrong. In any case, it looks like I am off to the local paint supplier for a true match.
Now, regarding value, I am thinking of painting the car the same basic color (see
http://www.teglerizer.com/triumphcolors/index.html ) with just a hint of pearl on the exterior only so that the interior exposures would still match and not look like a color change. From what I have seen, these cars just aren't going up in value, though there are few examples, but is it a sleeper? Has less than 60K on the clock!
...and thanks for the info and opinions!