Pre-WWII
N162 ..... Sharp examples of either Anson or Kelly are tough simply because of the law of "supply vs. demand" for these two cards.
E90-1 ..... Either one of these two cards in my current set of E90's are the toughest; as, they were when I completed my 1st set (circa 1990's).
...... OR ......
T206 ..... Any card with this back
T207 ..... For me Chet Hoff was the toughest
Post WWII
1949 LEAF
...... OR ......
1949 BOWMAN PCL ..... Any one of the 36 cards in this very scarce set
TED Z