The Pheon or Broad Arrow was used in England (and later Britain), apparently
from the early 14th century, and more widely from the 16th century, to mark
objects purchased from the monarch's money, or to indicate government
property. It became particularly associated with the Office or Board of
Ordnance, the principal duty of which was to supply guns, ammunition, stores
and equipment to the King's Navy.
This pocket watch with Borgel case from 1915 may have been used by the Royal
Navy during the Great War.