The Pocket Watch
They were the most common type of watch from their development in the 16th century until wristwatches became popular after World War I during which a transitional design, trench watches were used by the military. Pocket watches generally have an attached chain to allow them to be secured to a waistcoat, lapel, or belt loop, and to prevent them from being dropped. Watches were also mounted on a short leather strap or fob, when a long chain would have been cumbersome or likely to catch on things. This fob could also provide a protective flap over their face and crystal. Women's watches were normally of this form, with a fob that was more decorative than protective.
The watch was first created in the 16th century, initially in spherical (Pomander) or cylindrical cases, when the spring driven clock was invented. These watches were at first quite big and boxy and were worn around the neck. It was not for another century that it became common to wear a watch in a pocket. There are two main styles of pocket watch, the hunter-case pocket watch, and the open-face pocket watch. An open-faced watch is a watch in which the case lacks a metal cover to protect the crystal. It is typical for an open-faced watch to have the pendant located at 12:00 and the sub-second dial located at 6:00. Occasionall, A hunter-case pocket watch is the kind with a spring-hinged circular metal lid or cover that closes over the watch-dial and crystal protecting them from dust, scratches and other damage or debris. The majority of antique and vintage hunter-case watches have the lid-hinges at the 9 o'clock position and the stem, crown and bow of the watch at the 3 o'clock position.
Pocket watch movements are occasionally engraved with the word "Adjusted", or "Adjusted to n positions". This means that the watch has been tuned to keep time under various positions and conditions. There are eight possible adjustments: Dial up, Dial down, Crown up, Crown down, Crown left, Crown right, Temperature (From 34-100 degrees Fahrenheit) Isochronisms (The ability of the watch to keep time, regardless of the mainspring's level of tension). The pocket watch has regained popularity due to a sub-genre of cyberpunk known as steam punk, in which the pocket watch is a common accessory. Steam punk fans tend to choose pocket watches with visible gears and springs