Hi Steve,
Welcome to my world! Lots of the stuff I collect I can't find comparable pricing for. Here are some tips for you that might help.
- You already had a good idea. Look at the price of the same card with a different grade and extrapolate.
- The other thing to do is identify "like" cards from the set and see if they have any PSA 10 grades that you can use for comparison.
- You might need to look at similar sets and/or other cards of the player in other sets you believe are somewhat comparable.
Good luck!
jeff
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