I Recieved An 2007 Silver Proof Set For Christmas And These Errors Were In The Same Set. The Half Dollar Looks Like Machine Doubling, And It Also Has A Wire Struck Thru. The Sac Dollars Has An Unusual "s" Mint Mark, It Looks Very Skinny On The Top. Has Anyone Seen These Errors On Their 2007 Sets?
I just peeked at mine when they arrived to make sure the coins wasnt rolling around loose and put it in my safe, I'll have to get it out and check.
My guess is it is either strike doubling or the coins rotated slightly between strikes (2 strikes for proof coins).
Mike: Nice microscope! (Christmas present I presume). OCOPR48: That is strike doubling, as for the struck thru wire? That would be neat. How about a picture of that.