I inherited (or stole) my Grandfather's typewriter from my parents shortly after my husband and I moved into our last place. I've always loved vintage typewriters, and this one was just sitting under a pile of old books in my parents' office. Unused. Unloved. So I saved it. I've had it for about three years now, and I finally got around to putting in a new ribbon and giving it a spin - and it works beautifully!
In the photo above, I wanted to say, "It's working!" but after I hit the "g" I realized there was no key for the exclamation point. After digging around Google, I discovered that, a) according to the serial number, this Underwood model is from 1926, and b) older typewriters omitted the exclamation point because it was considered "redundant"and that it could be recreated by using other keys (combining the apostrophe and period).
If you're looking for new ribbon, I bought this pretty inexpensively. I also have the user guide for The Underwood Typewriter, models 3, 4, and 5. I'd be happy to send you the pdf if you need it. Just let me know!