A single wall hook bent by hand from solid brass rod, with a screw-in base: one screw and it's up. Fog Linen Work makes it for tea towels, aprons, keys and hats, and the unlacquered brass darkens to a warm patina over time.
Screw included. Mount into a stud or use an anchor suited to the wall. Because each hook is hand-formed, small irregularities are part of it.