I have found a no date penny it looks like it is 2000 (can’t see it to well in the picture). I’m going to keep it because I think it’s pretty cool, but it’s just a grease error. Because it is on the whole year is it worth any type of money. Edit. I forgot to add the photo
That's a neat one but in reality it's a grease filled Die which is common. I'd keep it if it was mine.
Hey, I would pay a dollar for it personally because it is cool with how it effected the entire date the way it did, so I would say it is worth that much. This is just my opinion though.