Ricker
Dirt Disciple
That problem solvers spacer makes it so you don't need a starfangle nut and cap- same idea as using the threaded rod, you just don't have to remove anything after tightening. Time made one bitd. Still one of my favorite looks, a-head stem without a capPlus, this looks interesting, I've never seen it before, an adjustable spacer?
https://problemsolversbike.com/products/headset/adjustable_spacer_-_6547