Jkersey

i've been using this tool for the last couple of years, it was found in my grandfathers things and is a fantastic little hammer and i've been trying to find out where it came from. It has been eating me inside though and i've done my own research, sadly though it's come up with nothing. Any leads or help would be nice. This is the full hammer. The serial number on one half And this is, sadly the worn off makers mark on the other half.