It's a nice example of a lamination, but it's not a clamshell.
A clamshell split planchet is also due to the improper metal mixture, but the metal splits on the horizontal edge of the coin, not on the surfaces.......
Retired Collector & Dealer in Major Mint Error Coins & Currency since the 1960's.Co-Author of Whitman's "100 Greatest U.S. Mint Error Coins", and the Error Coin Encyclopedia, Vols., III & IV. Retired Authenticator for Major Mint Errors for PCGS. A 50+ Year PNG Member.A full-time numismatist since 1972, retired in 2022.
Comments
WS
<< <i>Impurities in the metal mixing and stress from the copper being rolled to create the thickness needed for cents. Very common.
WS >>
I concur.
Hell, I don't need to exercise.....I get enough just pushing my luck.
but it's not a clamshell.
A clamshell split planchet is also
due to the improper metal mixture,
but the metal splits on the horizontal
edge of the coin, not on the surfaces.......