Boar's tusk helmet

The boar's tusk helmet is a type of military headwear used in Mycenaean Greece. The helmet was made of ivory from a boar's tusks and attached in rows onto a leather base padded with felt. 
Homeric epic.
A description of a boar's tusk helmet appears in the tenth book of Homer's "Iliad" where Odysseus is armed for a night-raid against the Trojans.
The number of ivory plates needed to make a helmet ranges from 40 to 140. Also, around forty to fifty boars would have to be killed to make just one helmet.