Well mysterious to me! My wife and I had just finished doing some errands and we were walking back to the car. We passed by an antique or junk shop (I do not know how they would describe themselves) and found this odd instrument displayed on the wall outside. I liked the shadow primarily but am intrigued by the tool's use. I'll stop and ask next time!
@randystreat@taffy@bob65@dide@wakelys@ankers70 thanks for your comments. My guess was like Suzanne's: some kind of corking tool. It turns out to be a shotgun shell hand reloading crimping tool cast iron bench mount.
Makes a great subject anyway! And lovely shadows.