can you please describe it?
The eagle carries the arrows of war in its right claw, and the olive branch of peace in the left claw
Twenty-cent piece (United States coin)
The right-facing eagle is near-identical to the one which Barber had rendered for the trade dollar, which had debuted in 1873. Linderman had realized that the difference in size between the new coin and quarter was small, and thought a scaled-down version of the trade dollar suitable for the twenty-cent piece; he got his way on the reverse. The eagle carries the arrows of war in its right, or dominant claw, and the olive branch of peace in the left, in heraldry preferring war over peace.
Art historian Cornelius Vermeule described the twenty-cent piece's obverse as "a pleasing synthesis of traditional elements". He was less complimentary about the eagle on the reverse, calling it awkward and a fatter version of the eagle on 18th-century American coinage. 
what is the twenty-cent piece? A coin struck from 1875 to 1878 who designed it? William Barber, Christian Gobrecht where is it produced? Philadelphia mint, Carson City Mint, San Francisco Mint
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Twenty-cent piece (United States coin) [SEP] Preparation and design
In anticipation of the approval of the legislation, Linderman had pattern coins prepared. In August 1874, Philadelphia Mint superintendent James Pollock sent him patterns with an obverse showing a seated Liberty by Philadelphia sculptor Joseph A. Bailly with a reverse by chief engraver William Barber. Pollock did not approve Bailly's proposal, deeming it too similar to the Seated Liberty design which was then on all domestic silver coinage, and so the new coin would too closely resemble the quarter. On March 31, 1875, after the enactment of Jones's bill, Pollock sent Linderman additional patterns, all by Barber, and even more on April 12.