Well, it seems the provided sources are about as helpful as a screen door on a submarine, offering little more than YouTube's legal boilerplate. But fear not, for I shall navigate these numismatic waters for you.
Let's talk about the 1972 Eisenhower "silver" dollar, a coin that often leads to equal parts excitement and disappointment. First, the hard truth: the vast majority of 1972 dollars you'll find jangling in an old coffee can are not silver at all. They're copper-nickel clad impostors, and unless they're in absolutely pristine, untouched condition, they are worth a grand total of... one dollar. Shocking, I know.
The real money is in the special collector's editions that the U.S. Mint produced. These are the fancy-pants versions that never had to suffer the indignity of a vending machine. Look for a coin with an "S" mint mark, indicating it was struck in San Francisco. These special Ikes were made with a 40% silver content. The uncirculated versions, often found in blue envelopes and called "Blue Ikes," are worth their silver content plus a small premium. The proof versions, which came in a swanky brown box and are known as "Brown Ikes," are the real lookers with a mirror-like finish and are worth a bit more.
But wait, there's a plot twist! The rarest and most valuable 1972 dollar isn't even silver. It's a specific variety of the regular old Philadelphia-minted (no mint mark) clad coin. This treasure is known as the "Type 2 Reverse." It requires a keen eye to spot the subtle differences in the depiction of the Earth on the back of the coin. Finding one of these is like finding a four-leaf clover in a field of three-leafers, and in high grade, it can be worth hundreds of dollars.
So, before you spend that big coin on a lottery ticket, check for an "S" mint mark. If it doesn't have one, get out your magnifying glass and start studying celestial cartography. You just might have a winner.
