The ultimate watch glossary – beginner’s edition, from bezels to bracelets The ultimate watch glossary – beginner’s edition, from bezels to bracelets

The ultimate watch glossary – beginner’s edition, from bezels to bracelets


Editor’s note: Watches can be intimidatingly confusing things, full of obscure parts with funny names. In this first part of our ongoing series ‘The ultimate watch glossary’, we start things off nice and slow with some entry-level terms. Even if you’re all over these terms, this page is perfect for sharing with your watch-curious buddies …


TAG Heuer Carrera Heuer 01 case profile
The modular case of the TAG Heuer Carrera Heuer 01.

The case is the exterior of the watch. It can be made from a range of high-tech or precious materials, but steel is most common. Typically, measurements are provided as the diameter, excluding the crown.


Omega SMP 300
The blue ceramic bezel of the Omega Seamaster Diver 300.

The bezel is the ring that surrounds the dial of the watch (on the outside), and typically plays a role in attaching the crystal to the watch. If the dial is surrounded by a separate internal ring, that is often referred to as a chapter ring.


Cream leather watch strap
Nomos on a Time+Tide strap.

The strap is a material band that attaches the wristwatch to the wrist. These are often made of leather but can be made of fabric, rubber, and other materials. A proprietary strap is a specially shaped strap that only fits the watch for which it was designed (in the same way, a proprietary lug system only accepts a strap that was designed for it and not an after-market alternative).


Audemars Piguet Royal Oak
The distinctive bracelet of the Audemars Piguet Royal Oak.

A bracelet is effectively a metal strap. They are normally comprised of ‘links’ that articulate the bracelet so it is wearable. An integrated bracelet connects to the case in a specific way so that it is part of the design. A famous example of this is the Audemars Piguet Royal Oak.

Water Resistance or ATM

Longines HydroConquest Caseback
The caseback of the Longines HydroConquest, displaying water resistance.

This number represents the equivalent pressure that the watch has been subjected to during a static test. One atmosphere (represented by ATM) is equal to 10 metres, so 300 metres and 30 ATM (or bar) means the same thing. Water resistance is typically displayed on the back (or sometimes the dial) of a watch. The thickness of the case walls, the strength of the crystal used, and effectiveness of the seals all play a part in the water resistance of a watch.

Movement or Calibre

IWC Automatic chronograph movement
An IWC Automatic chronograph movement.

This is the ‘engine’ that drives the watch. Movements or calibres often have specific alphanumerical code names such as ETA2824. These normally denote the manufacturer, and their in-house coding system for functions. A movement that has been made by the brand itself (or an affiliate company) is often referred to as ‘in-house’. This can be a contentious term.