A pocket watch is a watch that is made to be carried in a pocket, as opposed to a wristwatch, which is strapped to the wrist.
Savonette with cathedral hands and luminescent dial made by Thos. Russell & Son (probably in the 1920s)
A golden pocket watch with hunter-case and watch chain
Pocketwatches evolved from clock-watches, supposedly called Nuremberg eggs, worn on chains around the neck. Example by Peter Henlein, 1510, Germanisches Nationalmuseum Nuremberg.
A French pocketwatch from the 1920s
A pocket is a bag- or envelope-like receptacle either fastened to or inserted in an article of clothing to hold small items. Pockets are also attached to luggage, backpacks, and similar items. In older usage, a pocket was a separate small bag or pouch.
Patch pocket with topstitching and bar tacking on the back of a pair of blue jeans.
Pockets hang from belts as 15th-century peasants thresh siligo wheat in a Tacuinum Sanitatis
18th-century woman's hanging pocket
18th century-style hanging pockets