A bezel is the ring surrounding the crystal above the watch dial, which is used mainly for measuring time increments. Often made of precious metals, a bezel is commonly used to record elapsed time for diving, as well as to measure speed or distance. Undone currently offers two types of bezel: K1 hardened mineral glass and Ceramic.


Uni-Directional Rotating Bezel
Typically found on dive watches, this bezel is able to rotate in only one direction rather than both. This is for safety reasons when diving because it prevents divers from running out of air by overestimating remaining supply should the bezel be accidentally rotated in the wrong direction.
The watch case is a metal housing that contains various watch parts. It Holds the movement and protects it against dust, debris, Moisture and other elements. All Undone watch cases are made of 316L stainless steel with various coatings, which is extremely durable due to its rust and corrosion resistant properties.
Case Diameter
The diameter of a case is the measurement from one end of the case to the other not including the crown or buttons.
Case Thickness
The thickness is the measurement from the top of the crystal to the base of the case.


The watch crown is the knob on side of the watch case, which is used for adjustments of various functions on the watch like date and time. In addition to setting the watch, the crown is used to wind the mainspring. Therefore it is also known as a winder or winding stem. While watch crowns comes in various designs, they all serve the same purpose. One core feature found on all Undone watches is the hexagonal crown with Undone’s signature ‘U’ logo.
Screw Down Crown
To further enhance water resistance, crowns can screw into the case to form a seal against moisture or water by utilizing a gasket that compresses. A Screw-Down Crown is an essential feature for any watch you intend to do sports with, especially water sports like swimming, diving, surfing, wakeboarding, etc. The Undone Aqua features a screw down crown to ensure maximum water resistance.
A watch crystal is the window into the watch. It refers to the transparent cover that sits above the dial, which protects the dial and hands from dust, debris and other external elements. The most common materials for watch crystals are glass, mineral, sapphire and acrylic.
Sapphire Crystal
Sapphire crystal is an exceptionally hard transparent material that is chemically the same as natural sapphire or ruby, but it is colourless due to the absence of other elements of metal like iron or titanium. It is commonly used in high-end watches due to its scratch resistant property. It is extremely durable that it can only be scratched by diamonds. All Undone watches are using sapphire crystals.


Also known as the date magnifier, the cyclops is a small magnified lens on the crystal to enhance the visibility of the date. One of Undone Aqua’s distinctive design feature is our bespoke signature asymmetrical cyclops.
A watch dial or face is the surface of the watch that displays the time through the use of hour markers and moving hands.
Exhibition Caseback
The exhibition glass serves the purpose of showcasing the watch movement through a crystal located on the case back. All Undone exhibition case backs are using sapphire crystal for maximum durability. Undone offers further customization options of logo, photo or artwork printing on the exhibition sapphire for different personalization needs.
Hands are used in conjunction with a dial to indicate time on a watch. They are thin strips of metal attached to a center point of rotation of the movement. Undone currently offers 3 hands designs that come in various colours, with further customization requests available for private customization clients.


Hour Markers
Hour indicators applied or painted on the dial, also known as indices.
A jewel is a real ruby or synthetic gemstone that acts as a bearing for the gear trains to reduce friction which can adversely affect the accuracy of timekeeping.
The lugs are the extensions from the watch case, which allows that the bracelet, strap or band to be attached.
A movement is the engine or motor of a watch. There are three main types of movements including manual, automatic and quartz.


Mechanical Movement
This term refers to a watch that runs without any electrical source. It can be classified into manual and automatic.
Manual Movement (hand-wound movement)
A manual movement operates by manually winding the crown which winds the mainspring in the barrel, thus powering the watch. Once wound it will stay working for a period of time until it requires further winding again.
Quartz Movement
This is an electronic watch movement with a quartz crystal that oscillates when a current is applied to it. The power to run the watch is normally provided by a battery or a capacitor. A quartz movement is generally more accurate than a mechanical movement. A flat cell battery for a quartz watch typically lasts for 24 months
Automatic movement
An automatic movement operates with the same principle as a manual movement - with the addition of a weighted pendulum called the "Rotor". The Rotor is attached to the back of the movement, and when the watch is in motion (with regular wear) the rotor spins around the inside of the watch and "automatically" winds the watch, thus eliminating the need to constantly manually wind the watch. An automatic watch that has stopped due to non-wear should be manually wound 30-40 times before wearing again.


A rotor is found on every automatic movement, which is the oscillating weight that winds the mainspring when the watch is worn. It looks like a flat piece of metal that swivels about a pivot with the motion of the wearer’s arm, kinetic energy generated by the user’s movements can be collected and stored. Undone’s private customization service can offer rotor decoration and customization for individuals.
Similar to the bracelet or band, a watch strap is usually made of leather, rubber or a fabric such as nylon. It serves the same purpose as both the bracelet and band. Undone offers a wide range of watch straps that comes in different materials at the Undone accessories section.
Water Resistance
Watches marked as water resistant can withstand the effects of water to a limited extent. A watch's resistance to water decreases when it ages. Therefore a dive watch needs servicing once every 2-3 years. The Undone Aqua has water resistance up to 200m.