LEGO MOC Working Mini Combination Safe by mocbuild101 | Rebrickable - Build with LEGO
Mocbuild101's working locks and combination safes - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
How To Build A Working Lego Safe - with Real Combination Lock! - YouTube
Here I present my Lego Technic MOC combination lock safe. It has four eight letter word reels and can make 522 English words. You change the code using the hidden floor inside
LEGO MOC Word Combination Lock Safe by TechnicBrickPower | Rebrickable - Build with LEGO