Cards #122-128 were last-minute additions to the set and not included on the second checklist card #121.
In the mail today via eBay win is card #122 Gordie Howe "600 GOALS!". I found it pretty interesting that the card is very similar to his regular card #108. Gordie scored goal number 600 on November 27, 1965 vs the Montreal Canadiens, and Topps must have been anxious to celebrate his feat with a card. Cards #123-#128 feature team cards that are pretty hard to find.
Larry