DIY first time refinishing old floors in my 1876 home. Two types of wood. I assume the one room is oak and not original. Is the other room pine? If so how old would you guess it is? Original or no? Located in the Midwest.

Just applied polyurethane without stain. I would say I had a total of roughly 70 hours of running a drum sander. I hope I never have to do this again lol.