1:12 scaled Kir Kanos headsculpt for 6" inches black series figures. I left a pretty big peghole so it would every body you can find. Just fill the rest with some bluetack.
It would also go with some Legends and (especially) Classified figures depending on what youre going for. It's a bearded dude after all.
Results in the pics are from a FDM printer. Resin prints will be so much better.