I went with a Brittany Blue, Ford Paint code Q, 1624. This first came out on the '64 Thunderbird, and later on the '67 Mustang. There are actually 4 different Ford Brittany Blues, the first dating back to the 30's if I recall. It was more of a forest green than a blue ... The latest Brittany blue on Mustang Cobras is very different. There was a subtle shift in hue in '67-70

Digging in to this 18 months ago, I came to the conclusion that Brittany Blue and Viking Blue are one and the same. That said, the single stage paint of the 60's is not the paint of today, so the appearance is very different, and today's paint ages better.

Note the Britons were Viking stock ... :-)