United States, 2012 AD., Presidential dollar series, Chester Arthur issue, Philadelphia mint, 1 Dollar, KM 524.

United States of America, Presidential dollar coin program commemorative issue minted for collectors, Chester Arthur issue, engraver: Don Everhart (obv. and rev.), Philadelphia mint, 2012 AD.,
1 Dollar (ø 26,5 mm / 7,96 g), copper with manganese brass cladding: (Cu 88.5%, Zn 6%, Mn 3.5%, Ni 2%), 8,00 g. Theor. Mint weight, mintage 4.060.000 , axes coin alignment ↑↓ (180°), plain edge with inscription,
Obv.: CHESTER ARTHUR / DE / IN GOD WE TRUST 21st PRESIDENT 1881-1885 , his portrait facing right, engraver´s initials at lower right edge of bust.
Rev.: UNITED STATES - OF AMERICA / $1 / DE , Statue of Liberty facing left, value before, engraver´s initials at r. Edge.
Edge: 2012 P *** E PLURIBUS UNUM **********
KM 524 ; Schön 522 .

Year / Mint Mark / Mintage
2012 D 6.020.000 Position A - Edge lettering reads upside-down when the President's portrait faces up
2012 D Position B - Edge lettering reads normally when the President's portrait faces up
2012 P 4.060.000 Position A
2012 P Position B
2012 S 1.438.710 proof

Chester Alan Arthur (October 5, 1829 – November 18, 1886) was an American attorney and politician who served as the 21st President of the United States (1881–85); he succeeded James A. Garfield upon the latter's assassination. At the outset, Arthur struggled to overcome a slightly negative reputation, which stemmed from his early career in politics as part of New York's Republican political machine. He succeeded by embracing the cause of civil service reform. His advocacy for, and subsequent enforcement of, the Pendleton Civil Service Reform Act was the centerpiece of his administration.

From 2007 to 2011, presidential $1 coins were minted for circulation in large numbers, resulting in a large stockpile of unused $1 coins. From 2012 to 2016, new presidential coins have been minted only for collectors.
The act specifies that for a former president to be honored, they must have been deceased for at least two years before issue. The series ended in 2016, after honoring Ronald Reagan, the last President eligible.

More on https://en.wikipedia.org/wiki/Chester_A._Arthur ; https://en.wikipedia.org/wiki/Presidential_$1_Coin_Program ; http://www.usacoinbook.com/encyclopedia/coin-series/presidential-dollar-coins/