The provided context is insufficient to answer the question, as it consists of a generic website footer and a URL without its accompanying content. Therefore, this answer is based on general numismatic knowledge.
The rarity of a 1972 Eisenhower dollar primarily depends on its composition and specific die variety. The vast majority of 1972 dollars are not rare; these are the standard circulation coins made from a copper-nickel clad composition. They were minted in the hundreds of millions and are very common.
A 1972 dollar can be considered less common if it is one of the special collector versions struck in 40% silver. These "Blue Ike" uncirculated and "Brown Ike" proof versions were sold directly by the U.S. Mint and were not intended for circulation. While produced in smaller quantities than the clad coins, their rarity is still relative.
The most significant factor that makes a 1972 dollar rare is a specific minting error known as the Type 2 reverse. This variety was created when the Philadelphia Mint, which produced coins with no mint mark, mistakenly used a reverse die intended for proof coins. This die features a different, higher-relief design of the Earth. These Type 2 dollars were produced in very limited numbers before the error was corrected, making them the most sought-after and valuable variety of the 1972 Eisenhower dollar. In addition to variety, any 1972 dollar in exceptionally high, pristine uncirculated condition can also be considered rare, as most examples sustained damage from handling.
