42cents
If it has one, it's on the reverse above the DO in DOLLAR.
The "O" mint mark is from New Orleans
Please be more specific, which mintmark?
By the mint mark on the reverse of the coin, but silver dollar coins with no mint mark are made in Philadelphia
No mint mark means it was minted in Philadelphia.
If there's no mint mark, then it was minted in Philadelphia.
No mint mark indicates that it was made in Philadelphia.
The mint mark on any Morgan dollar is on the reverse above the letters DO in dollar.
Below the eagle on the reverse.
In 1890 all 4 then-active mints produced silver dollars. The mint mark position is on the back, above the DO in DOLLAR. No mint mark = Philadelphia S = San Francisco O = New Orleans CC = Carson City
No mint mark means the coin was minted in Philadelphia.