Are you sure about the "good working order" thing with Goodwill? Maybe call and ask.
In the past I have seen non-working sewing machines at Goodwill and thrift shops. It's just a good idea to place a piece of painter's tape on them saying "non-working" or "parts machine". In the case of your Rose, though, you could put on the tape that it works but that half a dozen of the buttons do not work. I have seen these types of machine sell for anything from $5 (for an old "parts only" machine) to $30 (which is what I think your Rose would fetch in a thrift sop, even with several buttons not working).