Based on general numismatic knowledge, as the provided context from the search results was not relevant to the question, the value of a 1972 U.S. dollar coin depends heavily on which version it is. The United States produced two different types of Eisenhower dollars in 1972.
The most common version is the circulation-strike coin, made of a copper-nickel clad composition. These coins do not contain any silver. Millions were minted in Philadelphia (no mint mark) and Denver (D mint mark). If you find one of these in pocket change or circulation, it is typically only worth its face value of one dollar. Only coins in pristine, uncirculated condition might fetch a small premium of a few dollars.
The less common and more valuable version is the collector's coin, which was struck at the San Francisco Mint and contains 40% silver. These coins were never intended for general circulation and can be identified by the "S" mint mark on the obverse, just below Eisenhower's bust. The U.S. Mint issued these 40% silver coins in two formats: an uncirculated version sold in a blue envelope (often called a "Blue Ike") and a proof version with a mirror-like finish sold in a brown box with a plastic capsule (a "Brown Ike").
The value of these 1972-S silver dollars is primarily based on their silver content, plus a premium for their collectibility. A 40% silver uncirculated "Blue Ike" is typically worth between $8 and $12, while the proof "Brown Ike" often commands a slightly higher price, generally in the $10 to $15 range. These values can fluctuate with the market price of silver and the specific condition of the coin.
