2007-S Proof Utah State Quarter
Struck on Elliptical Clip
74grs. Clad Planchet
PCGS PR 66 DCAM DISCOVERY COIN
First Known Proof Elliptical U.S. Coin
Cover of Mint Error News Magazine
When this proof elliptical U.S. State Quarter mint error was discovered in 2007 and authenticated and certified by PCGS, it had the distinction of being the first known U.S. proof coin that was struck on an elliptical planchet.
Since then, a few more have surfaced but this one stands alone as the discovery coin and is the only one that is football shaped (elliptical). The others were struck on elliptical blanks that expanded to the approximate diameter of the collar and are not elliptically shaped.
Below is the coin featured in
Mint Error News Magazine Issue 23: