There were 221K and 222Ks made in 1958 (Scotland), at least according to ISMACS. I couldn't find any made in the US factory that year.
I like the black ones with god decals the art nouveau decor on the chrome plates. I know some say their white 221 doesn't sew as good as their black 221 and vice versa. I guess it's all about detecting and sorting out minor issue, the quality of these are consistend and very good during the production years of this model. There are tan Featherweights too and I think some even have found crinkle finish machines.