10s seem to command a huge premium across the board, and I doubt in many cases you could tell the difference from a 9. Indeed, many 10s are 9s that bumped. No reason to think it would be any different in the case of the Mantle, with the one caveat being that there are so few 9s that the gap might not be as substantial as is the norm.
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My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
He is available to do custom drawings in graphite, charcoal and other media. He also sells some of his works as note cards/greeting cards on Etsy under JamesSpaethArt.
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