Based on the provided sources, which consist of links and website navigation but no specific content on coin values, a comprehensive answer must be drawn from general numismatic knowledge.
The value of a 1974 Eisenhower dollar depends entirely on which version of the coin you have. It is a common misconception that all dollars from this era are made of silver. The vast majority of 1974 dollars intended for circulation are made of a copper-nickel clad composition and contain no silver at all. These coins were minted in Philadelphia (no mint mark) and Denver (D mint mark). In circulated condition, these copper-nickel dollars are worth only their face value of one dollar. In pristine, uncirculated condition, they might fetch a small premium, typically just a few dollars.
However, the United States Mint also produced special collector's versions of the 1974 dollar at the San Francisco Mint, which bear an "S" mint mark. These coins were struck in a 40% silver composition and were never intended for circulation. The value of these 1974-S silver dollars is primarily tied to their intrinsic silver content, meaning their worth fluctuates with the daily market price of silver. They will always be worth significantly more than their one-dollar face value.
In summary, a standard 1974 or 1974-D dollar is generally worth one dollar. A 1974-S Eisenhower dollar contains 40% silver, and its value is based on the current price of silver plus a small numismatic premium depending on its condition, whether it is an uncirculated or proof strike.
