Mold in attic?

[Ellie Pritzer]

Considering viewing a house in Maine, built in 1880.

This photo of the attic is giving me pause because the black on the beams looks to my untrained eye like mold (from condensation? lack of ventilation?).
Does this look like mold to others or are there other possible explanations?

If I view the house and decide to move forward I would certainly have it inspected.
But would be good to avoid a multi-hour drive if the consensus here is mold.

Thanks!

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[Ellie Pritzer]

This was my first thread in the forum and it's not clear to me that the photo I tried to upload is viewable in the original post...apologies if no one can view it, I can't seem to figure out how to add it properly and can't delete the original post.