Possible Error Coin

Nahhh. Not needed. You evidently have little else to share or that supports your premise on this, and nothing to add that would clarify anyone asking questions on it, as to how it happens. And throwing in tripe such as "if you ever get lucky enough to find a dropped letter coin it will sometimes be associated with some of this struck thru grease" is pretty useless for those that do find dropped letter coins without the struck through grease you that is shown here.

I feel that this particular effect that the OP posted on has less to do with me "figuring it out" and letting you know, and more with finding someone who actually has an answer that supports both what they are saying and answers the questions I have about it. Too bad it wasn't you. You lost your opportunity to shine. Hopefully someone with more knowledge of how this particular effect happens in the mint as well as the ability to convey that information easily to others will chime in here.

 

Log in or Sign up to hide this ad.

If it was just grease then why would it be on random coins and not all of them? More importantly this obviously wasn't a isolated incident as others have found rolls with some with the same mark... When I get home I'll try to get pictures and try to post them. I think theres more to the story here.

 

Here's the front of one of mine.

Looks like the same issue.

 

I have a theory about these that I thought of when I first got a bunch of Washington dollar rolls and found a lot of coins with this pattern. I do think it is grease related. Grease does not compress well under pressure, it looks for any way out. If the die has just received a coating of grease, any excess will be forced towards the edges during the next strike. This film would be under enough pressure to affect the surface of the struck coin as it passes across it. Depending on the speed of the press (coins per minute) and the frequency of applying lubrication, this may happen to many coins per hour of production. Cool to look at but I believe it is just part of the manufacturing process.