(not an old part, but) I noticed that a couple of cool knobs (from several different stores/vendors here in Japan) were apparently made by the same US manufacturer:
http://kilointernational.com/knobs/
They are pricey (somewhat to a lot pricier) relative to other more typical (ones that can be found at many stores), but (IMO) the designs look first rate and they appear very well made (materials, dimensions).