Watch Glossary

Display indicating days elapsed in current lunar cycle from new moon to full moon.

Watch combining chronograph stopwatch function with mechanical alarm capability.

Mechanical mechanism that sounds an alert at a preset time, requiring a separate alarm barrel and trigger.

Mechanical striking system activating audible alert at predetermined time.

Photoreceptor that auto-adjusts display brightness based on surrounding conditions

Thermistor measuring environmental temperature for weather prediction applications

Traditional escapement design shaped like an anchor, most common in mechanical watches before lever escapements.

Calendar mechanism requiring manual correction only once per year in February or March.

Calendar watch combining annual and perpetual calendar features for extended accuracy.

Complication requiring manual winding of the mainspring only once per year, storing energy for 365 days.

Historic astronomical instrument adapted into watch form to measure celestial positions and angles.