I have to run, but I’ll be back later.
This is the law in effect at the time:
3. January 13, 1941 to December 23, 1952
If you were born between January 13, 1941 and December 23, 1952, you automatically acquired U.S. citizenship if both your parents were U.S. citizens and at least one had a prior residence in the United States. You didn’t have to do anything special to keep your U.S. citizenship.
If only one parent was a U.S. citizen, that parent must have lived in the United States for at least ten years prior to your birth, and at least five of those years must have been after your parent reached the age of 16. To keep your citizenship, you must have lived in the United States for at least two years between the ages of 14 and 28 (called a residence requirement). However, as a result of a U.S. Supreme Court decision, if you were born after October 9, 1952, your parent still had to fulfill the residence requirement in order to pass citizenship to you, but your own residence requirements for retaining U.S. citizenship were abolished. If your one U.S. citizen parent was your father and you were born outside of marriage, the same rules applied if your father legally legitimated you before your 21st birthday and you were unmarried at the time.
4. December 24, 1952 to November 13, 1986
If, at the time of your birth, both your parents were U.S. citizens and at least one had a prior residence in the United States, you automatically acquired U.S. citizenship with no conditions for retaining it.
If only one parent was a U.S. citizen at the time of your birth, that parent must have resided in the United States for at least ten years, at least five of which had to be after the age of 16. There are no conditions placed on retaining this type of citizenship. If your one U.S. citizen parent is your father and you were born outside of marriage, the same rules apply if your father legally legitimated you before your 21st birthday and you were unmarried at the time. If legitimation occurred after November 14, 1986, your father must have established paternity prior to your 18th birthday, either by acknowledgment or by court order, and must have stated in writing that he would support you financially until your 18th birthday.
There is an exception to this, if the citizen parent works for a government agency, international organization or is in the military, the residency requirement is only two years. Thus the question posted above, who did his mom work for at the time.
http://www.law.cornell.edu/uscode/8/1401.html (See section g)