Patina refers to the natural aging process that occurs on the surface of a watch over time, resulting in a unique and often desirable appearance. This phenomenon is particularly valued in the world of horology, as it adds character and individuality to each timepiece. Patina can develop on various parts of a watch, including the dial, hands, case, and even the strap, depending on the materials used and the environmental conditions to which the watch is exposed.

The formation of patina is influenced by factors such as exposure to sunlight, humidity, and the natural oils from the wearer's skin. For instance, dials may develop a warm, creamy hue, while bronze or brass cases can acquire a greenish or brownish tint due to oxidation. Leather straps may also darken and soften with age, contributing to the overall patina of the watch.

Collectors and enthusiasts often seek out watches with well-developed patina, as it is seen as a testament to the watch's history and authenticity. While some may prefer the pristine look of a new watch, others appreciate the unique story that a patina tells, making it a cherished aspect of vintage and well-worn timepieces.