Glad you asked. It’s a Calculagraph. They were the first patented mechanical time clocks. The large wooden handles marked Start and Finish would stamp a card with elapsed times. This one in particular served in a small aeronautics company in the 50’s, went on to tabulate table fees at a pool hall, and retired to the dusty basement of my new neighbor, who sold it to me off the sidewalk this weekend for five bucks. It is now my kitchen clock.