Kernow Collectors Pin. This one is of the Flag of St. Piran.
Saint Piran or Pyran was a 5th-century Cornish abbot and saint, supposedly of Irish origin. He is the patron saint of tin-miners, and is also generally regarded as the patron saint of Cornwall.
Saint Piran's Flag, a white cross on a black background, is used as a symbol of Cornwall. Saint Piran's Day falls on 5 March.