I don't know what it does to a card's value, but similar to how a card can show better than the grade, a card can show better than the qualifier. It's always worth checking each and every card because the qualifier might be a joke, but it could knock a certain card down to a phenomenal price/deal.
That being said, with T206s, I avoid all MK cards (unless it's a date stamp on the back) and most MC cards, especially if the name is cut off.
Use your discretion and don't buy anything you're not comfortable with.
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