The skin of the watch which holds together the internal movement is what we call the case. It is a strong and sturdy body that houses the entire watch structure and provides an externall appeal to the watch. A case is the metal housing of the watch’s parts. In simpler terms, it acts as an outside shell and protects the moving parts of a watch which include the bezel, the middle and the case back. The middle part is where the moving parts are present and is also known as the case band. The main function of the case is to house and protect the bezel, case back and the case band. It protects the moving parts from dust, moisture and shocks. Most of the cases are made with stainless steel and might have gold plating. But depending on the model and price, many brands create cases made of titanium, gold and platinum Watch cases come in various shapes. Watches that are less expensive have cases made of brass. The most popular ones are round, rectangular, square, oval, carre, carage, tonneau and asymmetrical. Each body type if fit for a particular watch shape. One should be careful about choosing the right case type.
The measurement of the case is done in various ways. To measure the case through the lugs or arms which extend from the top to the bottom of the watch lets you get a more precise vision of the case size. You can also measure the watch case size by the space between the lugs or the face of the watch. The various shapes and sizes that come in a case make it difficult sometimes to get the exact size. Hence for the precise reading you can view the inscription behing the case which gives you the size in mm.