The most recent addition to my PSA Graded 1975 Cubs set has pushed my set into the #5 position on the all-time list. I have also purchased a PSA 8 version of the #638 Cubs team card. When I receive it I should move up one more step to #4.
Currently, the 1975 Topps set has an overall grade of 8.237 and the set is 90.32% complete. To move any higher than #4 will take some real work and investment. The top three 1975 Cubs sets are all 100% complete and have average grades of 9.29, 9.23 and 8.79 respectively. The price for playing goes up substantially when one moves to PSA 9 or higher.