The bottom of the watch case that covers the movement.
The plate on the back of the watch by which you can access the battery. Most case backs are stainless steel, but some are hard plastic. A screw-in case back is one that requires a special tool to "unscrew" the case back. This ensures a higher level of water resistance. You can tell if you have a screw-in case back by the "notches" (usually 5 or 6) around the circumference of the case back.
The cover on the back of a watch which protects the movement. A case back normally snaps back into place or in the case of a waterproof model will be of the screw down variety to ensure water cannot permeate the seal. Information regarding each watch can usually be found on the outside of the case back.
The cover on the back of a watch which protects the movement. A case back normally snaps back into place or in the case of a waterproof model will be of the screw down variety to ensure water cannot permeate the seal. The case back has some important information about the watch engraved on it e.g. battery number, back number and water resistancy. All Rotary case backs are stainless steel except 9ct gold and sterling silver watches which have precious metal case backs.
The cover for the back of the watchcase that is removed to access the watch movement for service.
In a watch case, the cover on the side opposite the dial.