I have not seen a lot of anime, but some of the ones I have seen have pocket watches in them. Noir, Phantom, Fullmetal Alchemist, and Steins;Gate all have pocket watches of some sort in them and are usually an important piece at some point in the anime. How come many anime include pocket watches in them? Thanks.
These images are from Noir, Steins;Gate and Phantom: Requiem for the Phantom.