1972-S Roosevelt Dime
Double Struck - Both Off-Center
NGC PF 67⭑
This double struck Roosevelt Dime is cupped like a die cap with both strikes off-center. The pressure from the strikes also expanded the size of the planchet creating a very dramatic proof mint error.
Proof coins are struck by technicians who hand feed the blanks into special presses. They are produced, examined and packaged using extreme quality control. It is very unusual to find major proof errors. A few broadstrikes, off-centers, double strikes (in collar) and off-metals have been known to be found in sealed proof sets. Proof errors are aggressively sought after by many error collectors.