Free variant of the Düdel Clock, but for the wall.
Hardware:

Step 1: install the clock mechanisn into the pocket and bolt the lid

Step 2: bolt the clock face to the back piece

Step 3: push the hands into the clock moving parts

Two different STL sizes are given: Prusa MINI and MK3/4 sizes;
Given STEP for all the parts so feel free to design your own front face clock variants!
The author remixed this model.
adapted to wall