welcome to tool talk, a great place to learn and teach, plus you have made the day for some members, they thrive on pictures. this greetings comes from Massachusetts,
I do not have a positive ID for your tool, but if I may, will make a few comments on it.
(1) it may be possible that it has not been used ? looking at the picture, the right side looks like it may fit into a tool and goes in up to
the top of the square ??
(2) I also like the design as a punch, not saying that is what it is, but the design where you could hold the square shank and hit the left side,
the flare over the shank would direct the hammer away from your fingers on a slight miss. (yes, that happens )
just adding my 2 cents to the subject. enjoy this site.