Full Version: Improper Alloy Mix
CoinPeople.com > Specialized Numismatic Forums > Error and Variety Coin Forums > Online error coin refrence guide by Matt Dinger (Lost Dutchman) > Chapter 1 - Planchet Errors
Improper Alloy Mix – Coins are minted from metals that are mixed to form an alloy. Sometimes that alloy is improperly mixed, causing discoloration or streaking.
this planchet was not properly mixed
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