Discussion in 'Error Coins' started by Dan Galbato, Sep 22, 2023.
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Clear photos of the coin would be helpful. Especially helpful would be an edge-on photo showing the coin and a normal half, either stacked or side-by-side.
I think a specific-gravity test would be challenging, as the density difference between 40% silver-clad and cupronickel-clad is fairly small. An XRF (x-ray gun) test would probably be definitive.
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@SensibleSal66 …I believe this data chart has incorrect values…discovered a month or two ago. I just refer folks to a Yeoman Red Book…Spark
Thanks for your help.
thanks for your thoughts. You’re most likely correct but it’s strange that the half with a thicker copper planchet is only 11.3 grams and the half shown on the left has a thinner copper appearance and weighs 11.55 grams.
what I see is a thicker silver top surface with a thinner amount of copper between top silver surfaces? I’ll try adding one more image to show what I’m seeing. TKS
The coin on the left has a thinner copper core and weighs 11.55.
well within tolerance.
The apparent thickness or thinness of the cladding layers you see on the side varies widely; it all depends on how the metal was dragged across the edge as the blank was punched from the stock strip. So, yes, you're seeing different layer thicknesses on the edge, but no, that doesn't mean the layers are really different thicknesses -- they're just smeared at the edge.
The photos you're posting (excellent photos, btw!) look to me like a completely standard clad half dollar. If it were struck from silver, it would almost certainly have a distinctly different color -- I've only ever seen one or two 40% halves that look that much like clad.
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