The later 6000 series (6030 and later) Vikings were designed to be self-oiling so they don't give you oiling directions and the covers are a pain to open. They also can get stiff if they aren't used regularly. I've always thought that rather silly, I mean they aren't going to keep that oil-impregnated bearings going indefinitely. That was also why I decided to keep the 6020 for myself, it was the last TOL Viking machine that wasn't self-oiling.
I had a brown 6440 that I got for free from someone on freecycle and it had everything with it. It also needed the internal cam replaced and was really stiff until my Viking guru worked on it. He removed and steam cleaned the pattern mechanism and everything purrs now. My sister-in-law bought it from me for what I had in it and it is the perfect machine for what she does. BTW, the yahoo group list says the 6440 was produced 1975-77.