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Quite by chance I came across this article (the last article - fifth page from the bottom): http://www.britnumsoc.org/publications/Digital%20BNJ/pdfs/2006_BNJ_76_2_7.pdf It discusses a few varieties of reverse D.1 point
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1926 Penny Obverse 4 with Reverse C (this Reverse C appears to have extra definition)
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