A Pocket watch is timepiece that is carried in the pocket. It usually has a chain attached to it which can be used to secure it to a belt loop, lapel etc.
Some watches have a hinged cover or lid, which protects the face and is called the hunter case watch.
With the advent of wrist watches, pocketwatches lost their popularity, and is now rarely seen in use.
The right way to wear one, is opposite to your writing hand. The rationale behind this it seems, is so that you can write and at the same time look at your watch if necessary.
A limited range is carried by most manufacturers.