1968 Olympia SM9 Deluxe
Here's a nice Olympia SM9 Deluxe which dates from 1968. The SM9 is definitely one of the best portable typewriters for heavy use. The typing action isn't very heavy, but yet it's extremely responsive and reliable. Additionally, the paint is in great condition, although some of the chrome parts are slightly pitted. Overall, this typewriter would be perfect for someone who's looking for a workhorse to be used frequently and heavily.