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I think it's fairly safe to assume that the timber came from some old farm buildings. Log construction was very common in Finland up until 1940s or thereabouts. Apparently you can take apart a log house by starting from the top, and put it back together in reverse, so I guess the material is naturally suited to reuse.
The log frame in our house is normally visible only in the side / knee wall attics. We tore down some questionable insulation from the basement stairs, so that's why I could take the photo, but there's really nothing large scale I can show.
A bit of a dredge, but this tickled me on a personal level. The frame of our 70+ year old house is built from recycled solid timber, which—where exposed—looks not totally unlike some of the better preserved bits of that old cottage.