In the 1979 M*A*S*H TV series episode 'The Young and the Restless', first aired on January 22, 1979, Corporal Klinger changes his section 8 ploy from cross-dressing to pretending he is a civilian in Toledo and not in the army. During his "exit interview" with Colonel Potter, he reveals his Social Security number as 555-78-2643. In more recent airings, the center portion of the number is usually muted or bleeped.
555 78 2643
*Footnote: From numchk 555-78
we see assignment to California, estimated start of 1965. As this number is not in the short list of known numbers, it was most likely assigned to an American at some point. in retrospect, this was a poor choice by the writers to use a legitimate SSN number.