Welcome to the world of fine luxury timepieces. In order to familiarize yourself with various watch brands and its functionality, its important for you to know some of the standard terms in the industry. Here are some commonly used terms.

End of Life. In quartz movement, the second hand will start to "jump" every four seconds when the end of battery life is near.
A set of parts (i.e. the escape wheel, lever, roller) that convert rotary motion into balance.
Expansion Bracelet
The Expansion Bracelet or Band is designed to expand or stretch over the wearer's wrist and then contract snuggly on the wrist when released.