The rehaut, also known as the flange, is a component of a watch that serves both functional and aesthetic purposes. It is the inner ring that surrounds the dial and is typically located between the dial and the crystal. The rehaut can be used to display additional information, such as a tachymeter scale, minute markers, or other measurements, enhancing the watch's functionality. In some designs, it may also feature branding or decorative elements, contributing to the watch's overall aesthetic appeal.

The rehaut is often crafted from the same material as the watch case, ensuring a cohesive look and feel. It can be flat or angled, depending on the design of the watch, and may be engraved or printed with various markings. In luxury watches, the rehaut is sometimes used to display intricate engravings or logos, adding a touch of elegance and exclusivity.

In addition to its decorative role, the rehaut can also serve a practical purpose by providing depth to the watch face, creating a sense of dimension and enhancing readability. It acts as a transitional element between the dial and the crystal, contributing to the watch's structural integrity and overall design harmony.