Automatic/ Self Winding – Timepieces which wind themselves up by a rotor powered by hand movement

Balance – Together with the balance spring, make up the heart of timepieces, determines frequency and precision

Bezel – Top part of case, surrounding dial of the watch. Can be fixed or rotating. Bezels are usually marked with scales or indicators and sometimes serve as calculators.

Case – Housing for movement. It holds and protects the movement, usually consist of body, bezel and case back.

Chronograph – Timepieces with stop watch function used to time events.

Crown – Allows winding and hand setting. Connects to the movement through the winding stem. Superior water resistance achieved for watches adapting screwing systems (screw down crowns).

Crystal – Often refer as glass. It is the clear cover over the dial. Typical crystal material used are acrylic, glass, harden glass and sapphire

Dial – Face of the watch

Escapement – Responsible for translating power mechanically into a time keeping function

Full Calendar - Displaying date, day of the week and month on the dial, but needing a manual correction at the end of a month with less than 31 days

Hand – Analogue indicator of hours, minutes and seconds.

Hand Wound/ Manual Winding – Timepieces which winding is performed by hand.

Lugs – Protrusions on case ends that attaches strap or bracelet to the case.

Main Spring – Responsible for storing and transmitting power

Register – Also known as sub dial, display different information

Rotor – Oscillating piece which typically rotates 360 degrees responsible for winding timepieces

Tourbillon - Complication equalizes position errors due to changing position of the watch and related effects of gravity. Balance, balance spring and escapement are housed inside a cage, rotating one revolution per minute, thus compensating for all possible errors over 360