By the mint mark on the reverse of the coin, but silver dollar coins with no mint mark are made in Philadelphia
above the DO in dollar on the back :]
The mint mark on any Morgan dollar is on the reverse above the letters DO in dollar.
The mint mark (if it has one) on all Morgan silver dollars is on the reverse of the coin just above the letters "DO" in dollar.
No mint mark means it was minted in Philadelphia.
"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."
No mint mark means the coin was minted in Philadelphia.
Mintmarks are on the reverse above the letters DO in dollar
1892 Liberty silver dollar mint mark in on the reverse just above and between the D and O in Dollar at the bottom of the coin. Mine is marked with an S.
If there's no mint mark, then it was minted in Philadelphia.
No mint mark indicates that the coin was minted in Philadelphia.