The Hatpin

de bene esse: literally, of well-being, morally acceptable but subject to future validation or exception

“A hatpin has been designed that is intended primarily for use as a weapon of defense." (New York Tribune, 1904)

http://www.bartitsu.org/index.php/2013/04/womans-handiest-weapon-the-stiletto-hatpin-new-york-tribune-1904/