The **calendar function** is perhaps one of the simplest additional features on a watch, yet it comes in various t

The **calendar function** is perhaps one of the simplest additional features on a watch, yet it comes in various types. The most common is the **window-style calendar**, which itself has evolved into several forms. There are **three types of calendar changes** based on the speed of date transition: **(1) instant jump quick jump slow crawl**.

The placement of the calendar window on the dial is most often at the **3 o’clock position**, but there are variations. One notable variation is the so-called **“big eye” calendar**, which displays the tens and units of the date on two separate discs. This design allows for larger numerical displays, eliminating the need for a magnifying lens on the watch glass.

In terms of structure, watches with calendar functions are not overly complex. The main components that make up the calendar mechanism include the **calendar disc**, **calendar shift wheel**, **calendar transfer wheel**, **calendar positioning rod**, **calendar positioning spring**, **calendar quick adjustment wheel**, **calendar cover plate**, and screws.

This variety in **calendar types** offers watch enthusiasts a range of options to choose from, each bringing its own charm and functionality to the classic German watch design.