SIMPLE ANSWER: The 1928 Philadelphia issue (no mintmark) coin. Average retail value is $275.00 for a coin graded G-4.
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.
1895
From least to greatest: Penny Nickel Dime Quarter Half Dollar Gold and Silver Dollar
Two different One Dollar coins were issued in 1921. A Morgan dollar and a Peace dollar. In general the Peace dollars have higher values.
1794/5 Flowing hair silver/copper dollar U.S.
1922 is the most common date for Peace dollars, currently worth about $25 for the silver.
An 1804 silver dollar sold at auction at PRF-68 for $4,000,000. Fewer than 15 are known.UpdatesIn 2010 a 1794 flowing hair silver dollar sold for almost $8 million.
1922 is by far the most common date for Peace silver dollars. As of 19 May 2014, one is worth $15 for the silver.
1922 is by far the most common date for Peace silver dollars. As of 15 April 2013, one is worth about $19 for the silver.
1922 is the most common date for Peace dollars, most are valued only for the silver about $30.00-$37.00
The coin is NOT an Liberty silver dollar, it's a PEACE dollar (1921-1935) and assuming the coin is circulated and has no mintmark, retail values are $30.00-$37.00, this date is the most common of all Peace dollars.
1794/5 Flowing hair silver/copper dollar