
This was in a lot I recently got along with some other tools with the "perfect" handles(RR style pipe wrench and ball peen hammer so far).
It needs cleaned up but it looks like when the screw is loosened both sides of the handle drop down making it a T handle(or just a side handle if tightened with one half still up right).
It's sitting with another screwdriver I haven't seen before but looks to be a promotional multi-position handle.