Pocket watch - watches that still keep time

The pocket watch was initially produced with or without cases. The watches without cases are called open-face watches while the ones with cases are mostly known as hunter-case watches. Besides, these two types, there was another pocket type watch which has a lid but the user can look at the time through the cover since it is partially covered with glass. The most ancient ones were key-wind-set-time watches. There was a key to fix on the time-adjustment knob of the watch and then wind the time as well as set the time. To do this, the user has to open the back of the watch and then grip the knob using the key of the watch.  

The pocket watch produced during this time, had the key adjustment knob in the front panel. Therefore, the user had to open the front panel as well as the crystal glass of the pocket watch to fix the key to the minute handle to wind and set the time. Later, the stem-wind or lever enabled time-set watches were available during Queen Victoria’s time. The difference with this type of watch was they were with in-fixed levers which can be used to wind and set the time instead of using a separate key. While with some watches, the front glass should be removed to access the lever, others can be lever-accessible without removing the glass. 

In addition, there was the nail-settable pocket watch. With this type of pocket watches, an easy accessible pin was available to set and wind the time. All most all the ancient pocket watches were jewelled ones. In a mechanical pocket watch, the jewels were very small. More often the jewels used for this purpose were sapphires and rubies but other types such as diamonds and garnets were also used. Sometimes glass was also used. Nevertheless, these jewels were mostly unusable as gemstones and hence, possessed little monetary value. Commonly used type in this regard were holed jewels and the arbour of the watch operates on these jewels.  

The reason for using holed jewels was they provide extremely hard yet a very smooth surface for running the arbour of the pocket watch without friction when oiled. Rarely the running of the machine was flawed due to jewelled surface. Nevertheless, after the 20th century, instead of using jewels, many manufacturers used and still use synthetic jewels. Normally, a minimally jewelled pocket watch contains seven jewels. They comprise of two holed jewels, one roller jewel, two pallet jewels, and two cap jewels.