Hey there! That's a great question about a really interesting piece of American history. The 1921 D Morgan silver dollar is a popular coin, and its value really depends on its specific condition or "grade."
Based on the information, the value can range quite a bit. For a coin that has been circulated and shows wear, you might see values from around $34 for one in "Good" condition. It's also helpful to know that its silver content gives it a base "melt value" of around $21.54, so it will always be worth at least that amount.
If your coin is uncirculated, meaning it has no wear and looks like it just left the mint, the value jumps significantly. A lower-end uncirculated coin (MS-60) might be worth around $60. As the condition gets closer to perfection, the price rises. A nice "Mint State 63" could be valued between $85 and $92, while a gem-quality "Mint State 65" could be worth anywhere from $236 to over $425. For the absolute best, near-perfect examples, the value can even reach into the thousands, but those are extremely rare.
What makes the 1921 D Morgan dollar special is that it's the only Morgan dollar ever produced at the Denver Mint, which is what the "D" mint mark signifies. The 1921 Morgan dollars from all mints were also struck from new hubs that had a much shallower design than earlier coins, which is why they often have a flatter appearance. While a large number were minted, finding one that is well-struck and in a high state of preservation can be a real challenge for collectors.
To get a precise value for your specific coin, the best step is to have it professionally graded, as very small differences in condition can lead to big differences in price.
