I don't recall anyone caring about centering when I got into collecting in the 80s. Presumably they did, but I wasn't aware of it as an issue until I started seeing PSA cards with "(OC)" on the slab when I got back into collecting about 15 years ago.
I think the rule of thumb is:
OC cards sell for 2 grades lower,
MC cards sell for 3 grades lower,
MC cards (T206) sell for 0-4 grades higher depending on severity.
Makes sense.
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