What this coin looks like (obverse, reverse, mint mark location, special features, etc.): There are two major version of the 1973-S Eisenhower Dollar - both of them have a copper-clad composition. Most of the coins are mirror-like proof dollars as depicted above.
Although there is also an extremely rare and valuable variety that is actually a normal business-strike 1973-S Eisenhower Dollar - with a copper-clad composition (rather than the usual silver-clad composition for San Francisco "S" minted dollars). Only 2 coins of this type are known to exist and there may still be more out there! Below is an example image of what this coin would look like. (Note that the edge of this rare coin would have the clad copper-nickel color):
Coin valuation chart: Typical coin prices, values and worth per grade or condition - in USD