A sector dial is a distinctive watch face design characterized by its division into geometric sections or segments, often creating a structured and visually appealing layout. This design was initially developed in the early 20th century to enhance readability by providing clear reference points for time and other measurements. Sector dials typically feature concentric rings or tracks that delineate different sections, often accompanied by Arabic numerals or baton markers along the periphery. The design gained popularity during the Art Deco period of the 1920s and 1930s, incorporating geometric shapes, bold colors, and streamlined aesthetics inspired by the movement's architectural motifs. Despite changes in fashion and technology, sector dials have maintained their appeal due to their clarity, legibility, and timeless design. They are favored by collectors and enthusiasts who appreciate the blend of functionality and artistry, making them coveted items in both vintage and modern watch collections.