Classic black doorknobs are the little black dress of interior hardware; here's a roundup of some good choices.
Above: Black Porcelain Door Knob; $26 each at Rejuvenation Hardware.
Above: Fully Restored Antique Black Doorknobs; $60.90 a pair from Pasadena's Crown City Hardware.
Above: Baldwin’s Estate Knob (5041) in satin black; $147 for a full passage/privacy set at Baldwin Brass Hardware.
Above: Thomas Hoof Produkt in Germany offers a Porcelain Knob Door Set, which includes two knobs, for €29. Matching rosettes are available for €21.
Above: Acorn's Smooth Iron Passage Set features a flat black finish reminiscent of Early American styling. Set includes twin knobs and accompanying trim; $58.03 through Amazon.
Above: In the Design Voyeur category, NYC-based (but Brooklyn manufactured) high-end hardware purveyor Nanz is the holy grail. Above L: Model 1092; Above R: Model 1425. Locate dealers and peruse the offerings at Nanz.