Upper, entry level UO-10 model, circa 1979-1981, with non-original rear derailleur. +1 on the rims. The front appears to be original but I may be wrong. Just in case, have a good look at the forks blades and just behind the head tube lugs for signs of bent tubes. If there is any rippling, cracking or peeling of the paint in this area, it's been in a crash. It looks OK from the pics, but check it out, to be safe. Additionally, that stem looks like it's not inserted far enough. Make sure it's inserted to the hash lines, before you test ride it.