Alright, at a real computer now. So let's dissect the one photo.
Comparing the areas boxed in red and blue, (put side-by-side to show it more clearly) you can see the logs have the same pattern. In fact, it appears all the logs contain the same pattern. One could have almost argued that they could have been cut from the same stick of lumber, but the red arrows clearly show two entirely different endgrains, making that impossible. The machine cut tongue and groove, the odd two piece, back-to-back "D" logs, and the artificial texture doesn't seem likely for the early 20th century. But you say the house has been there for generations.
I agree with that likelihood. However, NOT in it's current appearance. The blue arrows explain what I believe is going on here. (and why you have those split-piece overdangles) What you have is a fairly recently done (within the last 30 years maybe) log facade covering the original building. The blue arrow logs are against the original sheathing of the home. The back-to-back pieces were added to the overdangle to give it a somewhat "whole log" look. You can even see the one overdangle of the upper red arrow, that they aren't even in alignment to each other, confirming the stubby piece doesn't extend into the house.
I'd bet the farm that the inside walls of the house are not logs, and suspect if the home was built in the early 1900's is probably balloon framed, with plank sheathing, and lath and plaster interior.
Redwood lumber is still available today. Don't get in the mindset that it isn't available anymore.
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