Hi-
I do not have too much too offer (as I do not collect graded cards), but I would imagine that the grading companies would be very rough on small paper wrinkles notorious in the 51 redback set (I collected these in the early 90s). If possible, I would examine each card under magnification before determining which ones to grade. Good luck with these either way.
Alan Elefson
aelefson@hotmail.com