Watchcase

A usually metal clamshell case for a mechanical watch,^[1] common until the early twentieth century. It is meant to sit around the inner case of the watch.^[2] The term refers to the component holding the main watch components.^[3]

A case for a pocket watch, 1870. The outer clamshell protects the watch. The inner layer contains a glass window. The ring is for the attachment of a chain.