My first thought was bottle opener. I searched images, and I can't seem to identify it as plow point or bottle opener. I'm trying to get some of the rust off in hopes that I can find some identification marks of any kind. I may never know.
Looks like a scraper off an older disk, it rides along the disks and scrapes the mud off to keep it from plugging up. Google a John Deere 220 disk scraper
Kyle-