I think that is a nice looking Lincoln! It seems to me that PCGS is forgiving of light frost on the Wheat Ear reverses. That coin might not have deep and clear enough fields for DCAM. The frost looks as good as the frost on my '56 DCAM... That said I don't think I would go to the expense of trying it again.
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odds are on it was graded right when it went into the holder...with-in reason.
Registry 1909-1958 Proof Lincolns
If you like it then buy it.Don't let other peoples opinions sway you either way. I don't think you'll go hungry if you buy the coin.
stewart