For the sake of clarity, I’ll be addressing the majority of the typewriter sales in the secondary market which are broadly the most common typewriters made for the commercial market after about 1925. Most of these were manufactured in the realm of hundreds of thousands to several millions each and are thus decidedly not rare.
In celebration of International Typewriter Day (which is today), Chris has put together this very useful guide and consideration for anyone interested in purchasing, repairing, and maintaining one.