Stephanieannsears74 Posted October 1, 2019 Report Share Posted October 1, 2019 Quote Link to comment Share on other sites More sharing options...
thedeadpoint Posted October 2, 2019 Report Share Posted October 2, 2019 Four answers! 1) The 1978 is copper whereas the other two are copper-clad zinc. 2) As such, they will wear differently and react differently to the many chemicals it comes into contact with over its lifetime. 3) The way they were struck by the Mint has probably evolved. 4) The dies they were struck with have different amounts of wear. Quote Link to comment Share on other sites More sharing options...
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