The 1893-S is still the highest value, a coin graded MS-67 has a estimated value of more than one million dollars.
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.
Carson City (CC) Morgan dollars are the most valuable, but all Morgans have some value.
The 1893-S Morgan Silver Dollar is the rarest and most valuable in the series, with a mintage of just 100,000 coins. In 2021, a specimen graded MS-67 sold for $2,086,875, setting a record for the Morgan dollar series. Due to its scarcity and high demand, the 1893-S Morgan Dollar remains a prized possession among collectors.
The last Morgan was struck in 1921. This coin is an EISENHOWER dollar, unless it has a "S" mintmark it's just a big dollar coin. Just spend it.
1921
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.
On the obverse at the bottom ( 6 o'clock position ) you will find the mint mark. If it has "CC" it is Carson City and the most valuable of Morgans. If no mint mark is present it is from Philadelphia.
Because there are less of these coins than of others of that series. Since there are less collectors are willing to pay more.
The most valuable American coin in current production is the half dollar. This half dollar is worth 50 cents when used.
It means the coin was minted in Carson City. Less than 10% of all Morgan Dollars were minted at the Carson City Mint. This scarcity generally makes the 'cc' Morgans the most valuable of the Morgan Dollars. It means the coin was minted in Carson City. Less than 10% of all Morgan Dollars were minted at the Carson City Mint. This scarcity generally makes the 'cc' Morgans the most valuable of the Morgan Dollars.
1895
It doesn't exist. "Morgan" describes the silver dollars designed by George T. Morgan that were minted from 1878 to 1904 and in 1921. If your coin is a genuine US silver dollar dated 1800 it would be called a Draped Bust dollar and could be quite valuable, but there are MANY counterfeits. Please see the Related Question for more details.