Clock-related terms starting with "C" and "F"

Are there any clock-related terms starting with "C" and "F"?

I have a pocket watch with these letters at the bottom, see the picture.

Here I found more examples:

• https://i.etsystatic.com/25146363/r/il/8be430/2715628756/il_1140xN.2715628756_5oim.jpg
• https://i.etsystatic.com/16309891/r/il/8c3f83/2394967974/il_1140xN.2394967974_hczz.jpg