Modern Coin Mart is showing a 2007 Platinum Eagle with the NGC slab marked "obverse struck thru". They have a close up pic showing the error but I can't see anything weird. What is it?
http://moderncoinmart.com/cart1/product.php?productid=25011&cat=7&page=1 I believe it's the "scratch" marks that appears above liberty. It may have been struck through a wire or thread.
Or, it could have been a thread. It looks like it meandered outside of the coining chamber, came back in and was struck through in two different places. Chris
obverse struck through means that there was something between the planchet and the obv die when the coin was struck and it was struck through that object. In the coin under discussion the object appears to have been a piece of thread.
Thanks, now I see what it means. I was looking for the back side to have been "struck thru" so you could see some of the image on the front side! That would probably be the mother of all error coins.
That can happen but they are not considered to be that important. It can happen by one of two methods, the dies can clash together transferring some details from one die to the other, or on thin coins continued use can transfer a faint "ghost" of the image from one die to the other.
Another way , sort of , is when dies clash on a foreign object and both dies are dented which will show on the coins struck by these dies. Here is an example . 1996 dent a by stoneman227, on Flickr
