what was the denomination of this coin?
Five-cent
Nickel (United States coin)
A nickel is a five-cent coin struck by the United States Mint. Composed of 75% copper and 25% nickel, the piece has been issued since 1866. 
who's face appeared on the five cent bill in 1866 UNANSWERABLE
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Nickel (United States coin) [SEP] Introduction
In 2004 and 2005, special designs in honor of the bicentennial of the Lewis and Clark Expedition were issued. In 2006, the Mint reverted to using Jefferson nickel designer Felix Schlag's original reverse (or "tails" side), although a new obverse, by Jamie Franki, was substituted. As of the end of FY 2013, it cost more than nine cents to produce a nickel; the Mint is exploring the possibility of reducing cost by using less expensive metals.