These styles were adorned with enamel, jewels, engraving and many other decorative elements, as well as being totally plain.These are fashion related and are not part of the pocket watch stylistic elements.although they can certainly add value to the piece.
Still, watches made before 1750 lacked accuracy and could lose hours in a single day.
European pocket watches have a regulator marked "A" for advance and "R" for retard.
American pocket watches are marked "F" for fast and "S" for slow. This word is French and means "blank" or "outline." This term refers to an incomplete watch movement or design that was later shipped to a different manufacturer that would then finish the watch.
The year 1675 saw the first watch that was small enough to fit in a pocket.
King Charles II of England was the person who set the style across Europe and North America.