If you want to do just the minimal amount of restoration, I would think a restorer could deacidify the paper and flatten the piece so it can be matted and framed. I wouldn't have him color the white spots because collectors do not like that. The piece has condition problems but you're lucky to have even found an uncut sheet so I would leave it with its creases and tears. By deacidifying it the paper will become significantly less brittle. That's all I would recommend you do.
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