A flat spiral spring within the balance wheel of mechanical movements that allows it to oscillate at a consistent frequency, controlling the accuracy of the watch. Also known as a hairspring
Some content about what the glossary is
A technique where a component is finished by brushing it with an abrasive tool, creating a pattern with fine lines. Various types of brushing exist, but most common are straight or linear brushing, circular brushing or sunray brushing. This technique can also be referred to as graining.
