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Rhett YeakleyThe Miller with C.F. designation would date to the same time as the E121 Series of 80 set (or earlier). The cards with O.F. designations date from the same time as the E121 Series of 120 sets (the producer changes all OF positions from R.F., C.F., & L.F. to O.F. and all bases from 1st B. to 1B., 2nd B. to 2B., and 3rd B. to 3B. in the later sets.
-Rhett