Ross,
I have a 1963 Ditzler paint chart and it shows a code of 12494 and 12794 for Acrylic Enamel for Viking Blue. Also, when getting ready to paint my car I went to Finishmasters (Southern Cal) and bought a quart of single stage paint to put on a couple of panels. Its code was Nason 95604IM and was listed as 1962-64 Ford Viking Blue Code E. I have to say when I finally had my car painted, I did a 2 stage Viking Blue and it was not close to the color on the panels I shot. However, I actually like the color I ended up with better than the original color I was going for. I also seem to remember a thread awhile back that talked about the Viking Blue colors and there might have been a couple of different Viking Blues available.
Jay
Here is the link to the Viking Blue thread
Which "viking blue" looks most like the