This can be easily assembled with the help of hot glue or any other glue, be careful about the proper orientation of the numbers, you can change the layer color of the numbers while slicing on PrusaSlicer, support & brim not required.
Clock mechanism kits are cheap and easily available, I used below shown kit.
https://www.amazon.com/gp/product/B08NGD5732/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1
Enjoy :)
The author hasn't provided the model origin yet.