This is a vintage pocket watch style where a hinged cover is used to cover the watch face when the pocket watch is not in use. This case is typically made of metal, could be simple, highly polished, or richly engraved in an elegant fashion and sometimes beautiful. This hunter pocket watch has its winding stem positioned at the 3 o'clock mark, thus requires manual winding.
Pocket watches were most famous in the 19th century and were even considered as status symbols. The protective cover also added a layer of elegance to the watch; it ensured that the watch was not scratched or broken easily due to normal wear and tear.