Well, after reviewing the provided context, which seems to be a collection of boilerplate links from YouTube, I can confidently say it sheds absolutely zero light on your coin question. So, let's toss that aside and get down to business with what actually makes a coin interesting.
First, we need to address the elephant in the room: the "silver" in your 1972 D silver dollar. The vast majority of Eisenhower dollars minted in Denver (that's the "D") in 1972 are, in fact, not silver at all. They're copper-nickel clad impostors, dressed up in a silver-colored suit. The U.S. Mint only made the 40% silver versions for collectors at the San Francisco mint. So, a standard 1972-D is about as silver as a spork.
This leads us to the heart of the matter. Because they made over 92 million of these clad 1972-D dollars, finding one is not a rare event. You could probably build a small, wobbly fort with the number of them still kicking around. In its regular, circulated state, a 1972-D is worth, well, a dollar.
So what makes one rare? It's all about the exceptions. The true rarity for this coin comes down to two things: pristine condition or a fantastic mistake. A coin that is in flawless, "mint state" condition, looking like it just rolled off the press yesterday, can be quite valuable to collectors who want the best of the best.
The real jackpot, however, is finding an error. The 1972 Eisenhower dollar is famous among collectors for having different design varieties on its reverse side (the one with the eagle on the moon). The rarest of these is known as the "Type 2" reverse, which has a distinct look to the islands of the Caribbean on the little Earth above the eagle. While this error is mostly associated with the Philadelphia mint, a few 1972-D dollars were accidentally struck with this rare die. Finding a 1972-D with a Type 2 reverse is the coin-collecting equivalent of spotting a unicorn. That is what makes one rare.
