Here is a fantastic very detailed history of the US 1840-1857 half cent. We have histories of all US coins here.
Large Cent Braided Hair (1839-1857)
1857 Year Braided Hair US Half Cents (1840-1857) for sale
Value of 1857 Braided Hair Half Cent
Half Cent Values Discover Their Worth
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US 1840-1857 Liberty Head (Braided Hair) Half Cent History
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