Mike, that is a beauty, especially the arm. And the stand is beautiful, too. Wow! Another for the list.
I wasn't aware of the 306K22. I looked it up and found pics of a two-tone tan/brown one. Very nice.
I've seen two versions of the 206K, the most noticeable difference is the width assembly. This is the one that is reputedly most similar to Pfaff machines but I've not seen an explanation.