Over-mintmark - One mintmark on top of a different mintmark, such as a 'D' over an 'S' (denoted D/S)
Overdate - A date made by superimposing one more numbers on a previously dated die.
over-mintmark: a coin with two mintmarks, one on top of the other.
over-dipped: a coin that has received one too many chemical baths in a mis-guided cleaning attempt. In other words, someone blew it! ...
Over-mintmark
A coin struck with a die on which one mintmark is engraved over a different mintmark.
With so many coins struck from so many dies, die-varieties, over-mintmarks and hubbing errors abound, making the series a fertile field of study for those delving into the intricacies of modern coinage production.
A coin which evidences the same characteristics as all other pieces struck from a given die or die pair, or from a die at a particular stage in its life. Refers to those die varieties such as shifted or doubled designs, over-mintmarks, and over-dates, ...
 See also: Strike, Denomination, Commemorative, Struck, Silver
  
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