It could be a leather working tool....to make long straight impressions in leather belts, boots, or saddles and such.
I took a tour at the Wooden Boat Museum in Mandeville over the weekend. They had several of these. It is a caulk pusher-inner thingy used in building/repairing wooden boats. In the old days they would soak hemp in tar or pitch and use this tool to force the hemp into the gaps between the boards.
Ahem. It is a caulking iron. Used to drive oakum into the gaps between planks to waterproof wooden ships and boats.
Hey, no need to get huffy. Sorry if my technical terms were over your head. I'm in mt phone - I'll post one later. Btw, no way would I have gotten that save for my paw in law wanting to go to the museum. Good one Sir Crimson.