It looks almost like a tool used to remove heads of roofing nails under shingle (like a popped up head) and hole to allow it to be hung on a belt wire of some sort.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)