Here is a fantastic very detailed history of the US 1840-1857 half cent. We have histories of all US coins here.
Half Cents (1793-1857) Value
1856 BRAIDED HAIR 1C, SLANTED 5 Rare Coin Wholesalers, a S.L.Contursi Company
US Half Cent Coins Facts, Grading Standards, and Specifications.
US 1840-1857 Liberty Head (Braided Hair) Half Cent History
1828 Classic Head Half Cent 12 Stars Early Copper Half Penny Coin Value Prices, Photos & Info
Value of 1856 Braided Hair Half Cent
US Half Cent Coins Facts, Grading Standards, and Specifications.
1857 1/2C, BN (Proof) Braided Hair Half Cent - PCGS CoinFacts
typeset' Complete U.S. Coin Design Set No Gold (1792-present) Digital Album - PCGS Set Registry
Seated Liberty Dollar (1840-1873)
US 1840-1857 Liberty Head (Braided Hair) Half Cent History
Photographic Grading Guide for U.S. Large Cents 1793 - 1857
THE CORONET HEAD HALF CENTS (1840-57), Park Ave Numismatics, Rare Collectible Coins
US 1840-1857 Liberty Head (Braided Hair) Half Cent History
1851 US half cent value, Braided Hair