Protip from someone who had to supply typewriter ribbons for about 40 typewriters of widely varying vintage for a couple of years: Amazon has every typewriter ribbon you could ever need. We even found a ribbon for this beast... the Oliver No. 9:
RIGHT?!? I know! There were a couple of different attempts at typewriter design early on, trying to figure out the best way to arrange the mechanisms to make them work well. This one is a real "winner" because it actually obscures what you are writing, as you write it. Check it out: People complain about only being able to see two or three lines... well about about only being able to see 6 or 8 characters of the line you are typing?!? You will rarely see an Oliver No 9 working. Ours you could type a word or two on, and then do another 20 minutes of service to get it working again....