MK in particular can be almost a non-issue for me. As you mention, a bit of pencil on a pre-war card can be worth it for me if it takes 1-2 grades off the price.
I've seen writing on the backs of cards - for example, brief updates on a player's career - that I think diminish the card very little. Overall I prefer clean cards, but some marks, especially those that suggest a genuine interest in the card and the player by a kid in the 1930s, can add a bit of character that helps make up for the "damage."
Last edited by ajquigs; 05-15-2016 at 10:04 AM.
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