Hello! That's a great question about a fascinating series of coins. The provided search result links are from excellent sources, but the text snippets don't contain the specific details, so I'll answer based on my expertise.
When determining which Eisenhower dollars are worth money, the most important factor is whether the coin is made of silver or a copper-nickel clad composition. Most "Ike" dollars you find in pocket change or basic coin rolls are the clad versions and are typically only worth their face value of one dollar. The real value often lies in the collector versions that contain silver.
The key thing to look for is the "S" mint mark, which indicates the coin was struck at the San Francisco Mint. From 1971 to 1976, the U.S. Mint produced special collector-edition Eisenhower dollars containing 40% silver. These "S" mint coins were sold directly to collectors and were not intended for circulation. Their value comes from this silver content, which makes them worth significantly more than one dollar based on the current price of silver alone. These often come in original government packaging, like blue envelopes ("Blue Ikes") for uncirculated versions or in brown boxes ("Brown Ikes") for proof versions.
Beyond the silver issues, a few rare non-silver varieties are also valuable to collectors. The most famous is the 1972 Type 2 Eisenhower dollar, which has a specific low-relief design of the Earth on the reverse. You can identify it by looking for three islands to the right of Florida, which appear less defined than on other types. Additionally, any Eisenhower dollar, even a standard clad one, can be worth a premium if it is in pristine, uncirculated condition. A professionally graded, high-quality example of a common date can be worth much more than face value to a serious collector.
In short, to see if you have a valuable Eisenhower dollar, first check for an "S" mint mark, as those are the 40% silver coins. If it's not an "S" mint coin, check its date and overall condition, as certain high-grade examples or specific rare varieties can also be quite valuable.
