A 1956 Silver Dime minted by the Philadelphia Mint. It has a straight clip making it a Incomplete Planchet Error. The first photo appears to be doubled but it’s not.
Since it is an incomplete planchet, why didn't the high minting pressure present force silver outward at the edge ? I would think the edge would not be a straight even height area, even if the planchett was produced previous to the die action. It looks rather man made. Jim
Liquid nitrogen and force. There are a large number of Youtubes that use coins and liquid nitrogen, and as more become aware of it , the number will increase, I am afraid. Jim
I think its a real planchet error coin. The rim edges are tapered, and the BE is quite obvious . We could use clearer photos.
I say it's a genuine incomplete planchet. @alurid has given the correct attribution. I also see a bit of the Blakesley Effect opposite of the issue.