Eames Century Modern Extra Bold.otf [upd] -

If your budget is zero, consider these open-source slab serifs that mimic the weight:

Casual users see a bold sans-serif. Typographers see genius in the details of the .otf file: Eames Century Modern Extra Bold.otf

It is the go-to choice for projects aiming to evoke a retro, 1950s–60s aesthetic. If your budget is zero, consider these open-source