Found this from Reddit user NoodlesMinecraft
This is the granddad of them all! Very well made! If you try it with an actual clock you’ll notice it doesn’t look near as nice!
- Wood Plank
- Wood Slab
- Trap Doors
- Item Frames
Place 2 items in a item frame (appearance only)
1. Place frame
2. Fill frame
3. Place second frame on the block face
4. Put your character’s head into the frame.
5. It will let you fill the second frame