The second Kennedy half dollar you posted is a special case and it is a post-strike separation, as noted by the diffuse details and wrinkled edge where the clad layer broke off. It is 40% silver clad so the core is only .791 copper and .209 silver which results in the dark grey color. How do I know that it is a 1969 Kennedy? Besides the dark grey color of the core, the outer clad layer looks more like .800 silver than cupronickel clad. There is a little nub at the truncation of the bust which is a D mintmark(1969 business strikes were only minted in Denver).
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