The first Peace dollar was struck in 1921 and no U.S. dollar coins of any kind are dated 1909, none were made. Look at the coin again and post new question.
The most two most valuable are the 1903-O Morgan and 1928 Peace dollar, followed by the '21 Peace and the '02-S and '03-S Morgans.
The Silver Dollar - 1909 was released on: USA: 15 February 1909
A Million Dollar Mix-Up - 1909 was released on: USA: 2 December 1909
It would be incredibly valuable because the last Morgan dollars were made in 1921. If you have a PEACE dollar, please see the Related Question for more details.
how much does a 1909 20 dollar gold pc weigh
President Taft engaged in what came to be known as Dollar Diplomacy from 1909 to 1913. The idea behind it was that the purpose of peace and stability in Latin America was to protect America's financial and business interests.
Yes, there were half dollars minted in 1909.
The term "key-date" means a more valuable or scarce coin of the series. But the 1923 issue is not one of them.
The is no 1921S Peace dollar; Peace dollars were not produced in San Francisco ("S" mintmark) in 1921. If your 1921 dollar coin is a Peace dollar, it was produced in Philadelphia and has no mintmark; if it has an "S" mintmark, it is a Morgan dollar produced in San Francisco).
The New Orleans Mint closed in 1909 so you can't have a 1926-O dollar. You may be seeing a "D" mint mark for Denver. If so, please check the Related Question for values.
They stopped making the Peace dollar in 1935.
SIMPLE ANSWER: The 1928 Philadelphia issue (no mintmark) coin. Average retail value is $275.00 for a coin graded G-4.