I bought this typewriter at the Seattle Antiques Market last year. It came with all of the paperwork, including the original sales receipt! When I bought it, the typewriter was covered in nicotine grime. However, I discovered a sure-fire way to remove it--Orange Palmolive dish soap.
This typewriter was sold by Burt Typewriter, at 1204 2nd Avenue. (Now the site of the former Washington Mutual Tower.)