Up on the blog today, how about a 1978 "not so missing" card for seven game Major Leaguer John Flannery, who played the entirety of his Big League career in September of 1977:
Flannery
 appeared in the aforementioned seven games for the Chicago White Sox at
 the end of the '77 season, going 0-2 at the plate with a run scored and
 a walk while getting some time in defensively at shortstop and third 
base.
Only 20 years of age at the time, he was back in the 
Minors by the start of the 1978 season, where he'd actually remain for 
the rest of his professional career, through the 1982 campaign when he 
played in Birmingham of the Southern League for the Detroit Tigers 
organization.
He never did get another shot at a Major League game again, finishing up with just those seven games.