Condition: This has noticeable tarnishing and wear, though does have decent relief with most of the major details intact. It has not been cleaned and maintains the patina it was found in. See pictures for condition. 
This is the 1928-P "key date" without mint mark where only 360,649 were made.

The Peace Dollar is a United States silver coin minted for circulation from 1921 to 1928 and again from 1934 to 1935.
History and Design
Specifications and Composition
Key Dates and Collecting