Knurled aluminium Michell cone knob, also known as the V2 knob. Used on the Luke V2 saber, ESB Leia comlink, TIE fighter pilot chestbox, Xwing, various sets...
12.7mm knurled cone knob. Threaded for M6 at the back.
I worked really hard on each of those to get a fully formed knurling and get them as accurate as possible to what we see on the vintage cone knobs.