1966 Olympia SM9
Up for sale is a nice Olympia SM9 which was manufactured in 1966 in Western Germany. This typewriter is in near mint shape all around, and is fully functional right down to the bell. Olympia typewriters have an excellent reputation for being well-built and engineered machines, and this one is no exception. The SM9 is one of my favorite portables to type with, and so I would highly recommend it for heavy typing- especially for heavy duties such as novel-writing.
Universal ribbons fit this machine perfectly, and it's a very intuitive machine to write with. The original cleaning kit is also included, which holds two brushes and a yellow Olympia rag. The owner's manual can be downloaded for free here: https://site.xavier.edu/polt/typewriters/OlympiaSM9.pdf
If you're in the market for an extremely trustworthy workhorse that's ready to be used heavily, then this is one of the best options out there.