Vintage Anglers Cosh / Priest / Sap / Blackjack

Description

Vintage Anglers Priest / Cosh / Sap / Blackjack
A priest (poacher's, game warden's or angler's "priest"), sometimes called a fish bat or “persuader” is a tool for killing game or fish.

The name "priest" comes from the notion of administering the "last rites" to the fish or game. Anglers often use priests to quickly kill fish.
Not sure what this is made of but suspect it could be whale bone?