Actually it looks like typical Indian war-hammer - ZAGNUL, as it was called in one catalogue, but verification of this name is much appreciated. Some catalogues called this weapon hatchet or even an axe, but I'm not sure why if the weapon was used only for striking not choping. In this shape known also in Persia and Turkey but from 18th century, not earlier. Earliest one has a beak straight or slightly curved, and were very very dangerous
