1978 Smith-Corona Classic 12
This blue Smith-Corona Classic 12 isn't the prettiest in my opinion, but it's one of the best typewriters for heavy use. This machine is no exception, and works flawlessly. It also comes with some extra paperwork, such as the owners manual, warranty, unpacking instructions, etc. (see pictures)
If you're looking for an affordable workhorse, this is definitely one of the best options. Equipped with a 12 inch carriage, this machine can also type on larger sheets of paper, or it can also type landscape-ways on a regular piece of paper.