Circulated
A 1973 Eisenhower dollar from the Denver or Philadelphia mint in circulated condition is worth $1 to $3.
Uncirculated
An uncirculated 1973 Ike dollar from the Denver or Philadelphia mint is worth $13 to $15.
Proof
A silver-clad proof 1973 Eisenhower dollar coin was minted in San Francisco and issued in the 1973 proof set. It is worth about $12.
Blue Ike
A silver-clad uncirculated 1973 Eisenhower dollar was minted and packaged inside a blue envelope for collectors. These often are referred to as "blue Ikes" and are worth about $10.
Brown Ike
A silver-clad proof 1973 Ike dollar was minted and packaged inside a brown box for collectors. These often are referred to as "brown Ikes" and are worth about $25.