"Working but needs new ribbon" is seller's code for "I have no idea if it really works, but I'm going to try to sell you this machine for the price of a fully functioning machine that was just serviced by a professional shop despite the fact that I just took it out of grandpa's barn and I'm not sure if the mouse inside is dead or not. Also, I can't afford $10 to replace an old ribbon to truly participate in the charade of the price I'm going to try to fleece you with."