Case
A
B
- BezelThe round outer ring that frames a watch dial and holds the crystal in place
- Bezel insertA separate ring of ceramic, sapphire or aluminium fitted to a watch's bezel
- Bidirectional bezelA rotating bezel that turns both clockwise and anticlockwise
- Box crystalOne of several watch crystal shapes, alongside flat and domed
C
- Cabochon crownA watch crown topped with a smooth, domed gem, a trademark detail of Cartier
- CaseThe outer shell of a watch that covers and shields its inner parts
- CasebackThe rear cover of a watch case, on the side opposite the dial
- Clous de ParisA surface pattern of small raised pyramids lined up in neat rows
- Coin-edge bezelWatch bezel with fine machine-cut grooves around its rim, like the edge of a coin
- Count-up bezelRotating ring that shows a diver how long they have been under water
- CrownThe knob on a watch case used to wind the mainspring and set the time
- Crown guardsRaised parts of a watch case that shield the crown from accidental knocks
- Crown tubeSmall insert in the case side that guides the winding stem and carries the crown
- CrystalThe clear cover over a watch dial that guards the dial and the hands
- Cushion caseWatch case like a softened square, its corners rounded until it bulges like a pillow
- CyclopsSmall magnifying lens on a watch crystal that enlarges the date
D
- DestroA watch with its crown on the left, made to be worn on the right wrist
- Display casebackSee-through window in the back of a watch case that shows the movement
- Dodecagonal caseA watch case or bezel shaped with twelve straight sides
- Domed crystalA watch crystal that curves over the dial instead of lying flat
- Drilled lugsWatch case lugs with a hole bored through each side for the spring bar
E
F
G
H
- Half hunterPocket watch case with a window in its lid, so the hands show while it stays shut
- Helium escape valveSpring-loaded one-way valve that lets trapped helium out of a dive watch case
- HesaliteOmega's name for the acrylic glass it uses for its watch crystals
- Hinged casebackA watch case back that swings open on a small jointed pin at the edge of the case
M
O
P
S
- Sapphire crystalMan-made aluminium oxide crystal that covers a watch dial and resists scratches
- Screw-down casebackA back cover that screws into the watch case to give a secure seal
- Screw-down crownA winding crown that threads onto the case to keep water and dust out
- Screw-down pushersChronograph buttons that screw down to lock, so they cannot be pressed by accident
- Snap-on casebackA watch back pressed onto the case and held by friction, not screwed down