having some curvature to it and a place for a set screw, it reminds me of an air intake adjuster from a gas valve. not sure if that's what it is though
Welcome to Tnet. your hooked now and you will find all sorts of stuff that you cant Id. I will say it's worth more than the penny, into the scrap bucket and off to the next find. HH
BK
My guess would be a blade leg from a 220 volt plug? dryer or some 220 volt motor.