Is it too soon to share which card you're missing from the set?
I used to collect White Sox team sets years ago. The high numbered cards from the 1960's were always a bear to find, particularly in quality condition. The 1967 Tommy John was particularly tough to find because it was the last card issued in that set.
"It's not the high price of stardom that bothers me...it's the high price of mediocrity." - Bill Veeck