Upgrading my 1953 Bowman color and 1971 Topps Baseball sets. My 53 Bowman Color overall is in excellent condition; the Mantle is a newer PSA 4 and the Reese is ungraded but also in vg/ex. I should leave well enough alone, but I am upgrading some commons and minor stars which probably won't make that much of a difference to the set, but could easily run another $500.
The same with my 1971 baseball set. I've replaced some cards three times and now have nearly 1,000 extras as a result with a list of 69 more cards to upgrade and I'll probably do the same for my 1972 and 1975 sets. Compulsive madness!
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