Peewee wrote:
Well since I'm old enough to fart dust, to me, it looks like a tool to puncture tin cans... like oil cans or beer. Usually attached to a wall or post, slide the tin can under the point and push up from the bottom. Makes a little triangular hole in the can which you can either drink or pour from. That's my best guess and I'm sticking to it. Some cans use to not have pull tabs or lids you could unscrew.
Yep, Peewee, I too am old enough to remember cans with no pull tabs. But this "tool" looks to big for that. My son thought I should know. But I have no idea.
Some of the suggestions here seem pretty feasible.