EGR
I Cleaned out the shed and found this "hammer"
It Seems rather specific for the profile
So Before I invest in a new handle... What is this thing ?
I looked into Seller's Dictionary of American Hand Tools (1990), the hammer resembles a riveting hammer which is a tinsmith's hammer, generally weighing from 1 to 64oz. OTOH I'm also inclined towards the archeologist's hammer proposal though yours does have the straighter peen end and no collar around the handle where it mates to the head. The book lists a few different forms of rivetting hammer, some with round pointed peen others with wedge shaped ends like some masonry related hammers.