That looks like it just left the factory, congratulations. I have a 6450, basically the same. The more complicated utility stitches, like the overlock, really work well and are a joy to use. My very favorite feature, though, is the crawl gear. Ultimate control, go as slow as you want.
The yahoo group for vintage Husqvarnas - or Vikings - is run by a guy called Bill Holman. He seems very knowledgeable, and diagnoses most issues in a post or two. Worth checking out.
Stein