The "key" card of virtually ever issue between 1907 and 1921 is that of Ty Cobb.  Though the 1921 E121 American Caramel issue also contains Babe Ruth cards that would qualify as the "keys" to the issue, the Cobb remains important, and is also one of Cobb's more popular cards, due to its relative affordability and his portrayal as the team's manager.  Presented here is an attractive midgrade card, graded VG-EX 4 by PSA, cut very high on the canvas but otherwise quite strong, with EX corners and a clean image.