Hi, sorry the title isn't super specific. I know nothing about coins, but I was going through my grandpa's old collection and found this [the coin on the left]. I first thought it was a
Liberty nickel (hence why one is there as a comparison) but it looks like it's slightly bigger, flatter, and has a different back to it. Does anyone know what this is? I couldn't find it anywhere online. Sorry I can't be more specific with details

