A 21st-century type coin set consists of one coin bearing each design produced by the United States Mint during the 21st century. That is an enormous number of coins (commemoratives, state quarters, ATB quarters, Sacagawea dollars, etc) in both circulated/uncirculated and proof finishes. We must not forget the material of the coins like clad, silver, gold, copper, platinum, etc.
The NGC type coin registry takes the one type coin for the series approach. Therefore that is only one State Quarter, one America the Beautiful Quarter, one Sacagawea Dollar and one Presidential Dollar required. They only consider coins that were meant for circulation, so no commemoratives and no gold or platinum coins.
I decided to collect a NGC-like 21st century type coin set but, looking always for perfection, my collection is made only by PF70 coins.
Let's show it, in order of value and year of each coin.
The twenty-fifth is a PF70 UC 2009-S $1 "Agriculture" Native American Dollar.
The composition of the coin consists of a core of pure copper with an outer layer of manganese brass consisting of 77% copper, 12% zinc, 7% manganese and 4% nickel. It has a diameter of 26.5 mm and weight of 8.1 grams.
The info below comes from https://nativeamericandollars.com/
"The Native American Dollar coin series launched in 2009 to honor the contributions and accomplishments of Native Americans. Each year, a unique reverse design representing a different theme has been paired with the popular obverse design featuring Sacagawea.
The reverse design for the first year of the program carried an agriculture theme. Agriculture had played an important part in Native American culture as they sought to live with the land and understand the surrounding natural resources."
NGC graded 9,917 2009-S $1 "Agriculture" Proofs, with 2,483 as PF70 UC. 2,179,867 coins were minted in San Francisco in 2009.
I bought this coin in 2013 for $31.00 and today's price is around $60.00.
"The “Three Sisters” method of planting is depicted on the reverse of the 2009 Native American Dollar. A woman is shown planting seeds in a field of beans, corn, and squash.
The reverse was designed by Norm Nemeth."
The obverse design, featuring the portrait of Sacagawea and child, was designed by Glenna Goodacre.
Thank you for reading. Please comment, upvote, resteem and advise me.