It was minted in SF ( I found the S mark but not where everyone keeps saying where it is, which is UNDER the word One and by the Tail Feathers).
If a mintmark is not on the reverse under ONE, then it is a Philadelphia coin. Under the truncation of the neck is the designer initials, AF for Anthony di Francisci. 1923P is the second most common Peace dollar
and it is currently worth its silver value.