This is a really cool retro video explaining the mechanics of a watch. Breaking down the role of every single part and the name of each component. With this knowledge, you can now know if your Rolex service center is trying to hustle you by changing parts you don't have to change anymore ;)
P.S the stop motion filmography at 8:20 is adorable and reminiscent of the "Soupe Opera" stop motion video that they used to show of fruits transforming into various animals (see link below if interested).
Soup Opera: https://www.youtube.com/watch?v=Y1zo9VKxRKw