No D's in 1928. The coins were only struck in Philadelphia and San Francisco. The S coins run from $30.00 to $70.00 in circulated grades.
There has never been an A mint mark. You're looking at the designer's monogram. The mint mark will be on the back between the word ONE and the eagle's tail feathers. See the related question for more details.
To explain the letters on bills, "D" isn't a mint mark. The US Mint only makes coins; all 1928 bills were printed by the Bureau of Engraving and Printing in Washington. A small "D" below the date indicates that the bill was printed as part of the 5th set of 1928-series bills, which in this case refers to the administration of Secretary of the Treasury Henry Morgenthau, Jr. and US Treasurer W. A. Julian. There's more information at the question "What is the value of a 1928 D US 2 dollar bill?".
The U.S. has never used an E mint mark. My guess is that you're seeing the small D (Denver) mint mark that was used on coins up till the mid-1980s.
The value of a silver dollar varies based on its condition, year, and mint mark. As of now, common silver dollars like the Morgan and Peace dollars, which contain 0.7734 ounces of silver, are usually worth at least their melt value in silver, approximately $20 to $25, depending on current silver prices. Collectible or rare silver dollars can be worth significantly more, sometimes hundreds or thousands of dollars. Always consult a numismatic expert or current market values for precise assessments.
None of the Eisenhower dollars struck for general circulation have more than face value. Only proof and uncirculated collectors coins sold from the Mint have premiums.
If the 1928 Peace dollar has no mint mark, circulated coins have retail values of $275.00-$430.00 depending on the grade.
If the 1928 Peace dollar has no mint mark, circulated values are $290.00-$450.00 depending on the grade
The mintmark is on the reverse of the coin underneath the "One" in "One Dollar"
1928 makes it a Peace dollar. The mint mark is located on the reverse (tails) side, below the word "one." D for Denver, S is San Francisco, and no mark is Philadelphia.
1928 would make it a Peace dollar. The mint mark is located on the reverse (tails) side, just below the word "one."
About $150.
42cents
About $27.
If you mean a 1928 Peace dollar with No mint mark It's the key date to the series the value in VF-20 is $475.00. I suggest you take it to a coin dealer, because I have seen many 1928 S mint coins with the mint mark removed.
"DO" isn't a mint mark. The mint mark on a silver dollar for that year is on the reverse (tails) side, just above the letters "do" in the word "dollar."
One Dollar
There has never been an A mint mark. You're looking at the designer's monogram. The mint mark will be on the back between the word ONE and the eagle's tail feathers. See the related question for more details.