The best I can tell there is no way to know until the '69 catalog. At that point they went with a two ink print (black and yellow) that showed that paint scheme...EXCEPT that the payload section just had a narrow yellow band around the top instead of being all yellow. You can see for your self at http://www.ninfinger.org/~sven/rock...a/69cenp82.html.
Hope this helps!

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J. Stuart Powley
NAR 29573
"Gravity is a harsh mistress."