my prized possession is a bowie knife. It is a kind of pattern of fixed-blade fighting knife 
What material is the handle  made of?
Bowie knife
A Bowie knife ( ) is a pattern of fixed-blade fighting knife created by James Black in the early 19th century for Jim Bowie, who had become famous for his use of a large knife at a duel known as the Sandbar Fight.
Since the first incarnation, the Bowie knife has come to incorporate several recognizable and characteristic design features, although in common usage the term refers to any large sheath knife with a crossguard and a clip point. The knife pattern is still popular with collectors; in
"navaja" was originally used primarily by the "barateros" of the underworld and the working class, but by the 1800s it had become an accepted personal weapon for Spanish men of all backgrounds, including the wealthy.
In Portugal, the "faca", a large fixed-blade fighting and utility knife accompanied Portuguese explorers and settlers during their conquest of Brazil, where the pattern remains popular to this day. From the "faca" is derived the "facón", the large fighting-utility knife of the