My guess would be heat, I imagine the high speed presses would get pretty hot when striking the plated coinage...
"Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer
motoryoda...I think you and SPP are probably correct, but weird how the problem comes from the middle of the coin and works it's way outward....No lines coming off queen's bust though...strange.
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