They're PRINTING their own unmarked money.
Money Heist Season 1, Episode 4
PRINTING money...
Money Heist Season 1, Episode 10
and Nairobi had the PRINTING presses
working at full capacity.
Money Heist Season 1, Episode 11
-Those at the PRINTING press, there.
-Don’t talk about the plan to anyone.
Money Heist Season 1, Episode 11
to keep PRINTING money.
Money Heist Season 1, Episode 10