Coins

Machine doubling
 

I kno its an s im not dumb want to know bout the mark behind or on it its a 1972 S penny
 

How can u tell the difference between md and dd exactually?
 

How can u tell the difference between md and dd exactually?
Mechanical/machine doubling is flat in appearance and there are serifs in the mark that are not separated. In Double Dies, there is a clear separation between the serifs on most or whole mintmark.

MD vs. DD NGCCoin.com
 

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