HAMMER

Steel or brass element used in movements provided with a repeater or alarm sonnerie. It strikes a gong or bell.

HAND WOUND
A mechanical watch which must be wound regularly to keep it running.

HAND
Indicator for the analogue visualization of hours, minutes and seconds as well as other functions. Normally made of brass (rhodium-plated, gilded or treated otherwise), but also steel or gold. Hands are available in different shapes and take part in the aesthetic result of the whole watch.

HEART-PIECE
Heart-sheaped cam generally used to realign the hands of chronograph counters.

HELIUM-VALVE
Valve inserted in the case of some professional diving watches to discharge the helium contained in the air mixture inhaled by divers.

HEXALITE
An artificial glass made of a plastic resin.

HUNTER CALIBER

A caliber characterized by the seconds hand fitted on an axis perpenicular to the one of the winding-stem.