I think the point is that in 1977 when it seems this SS# was issued, and thru to today, anyone eligible for an SS# can apply to any SSA office s/he chooses. It may not seem logical for a teenager living in HI to apply through a CT office, but it’s not illegal. Applying for multiple SS#’s is illegal, if that was, in fact, done.
In 1977 the process was centralized.
http://www.ssa.gov/employer/stateweb.htm
“Since 1973, social security numbers have been issued by our central office. The first three (3) digits of a person’s social security number are determined by the ZIP Code of the mailing address shown on the application for a social security number. Prior to 1973, social security numbers were assigned by our field offices. The number merely established that his/her card was issued by one of our offices in that State.”
So the rule in effect in 1977:
The first three (3) digits of a person’s social security number are determined by the ZIP Code of the mailing address shown on the application for a social security number.
The zipcode on the application was from Conn.