there are several that I think would be highly desirable.
'51 Bowman Mantle
'51 Bowman Mays
'54 Topps Aaron
'54 Topps Banks
'55 Topps Koufax
'55 Topps Clemente
those would be a few off the top of my head...
1955 Topps Baseball PSA 7+ set progress: 49/206 (23.79%)
Always looking to add to my silver stack. Check out my thread in the metals BST section if you've got some available!