As of my last knowledge update in January 2022, the 1804 Silver Dollar is indeed one of the most famous and valuable coins in American numismatics. It is often referred to as the "King of American Coins.
Several classes of 1804 Silver Dollars exist, and they were actually minted in the 1830s as diplomatic gifts rather than during the stated date.
For the most accurate and up-to-date information on the value of an 1804 Silver Dollar, it is recommended to consult reputable numismatic publications, auction results from well-established auction houses, or seek the expertise of professional coin appraisers.
The rarity and historical significance of the 1804 Silver Dollar make it a highly coveted piece among coin collectors, and it often commands substantial prices when it becomes available for sale.
The Class I 1804 Silver Dollar is considered the rarest and most valuable. Only eight specimens are known to exist, and each bears a distinct history. One notable example is the Dexter Specimen, named after its last private owner, James V. Dexter.
Only one Class II 1804 Silver Dollar is known, and it resides in the National Numismatic Collection at the Smithsonian Institution. These coins were also struck in the 1830s and have distinguishing characteristics.
he reported value of $3.8 million+ for an 1804 Silver Dollar is consistent with the rarity and desirability of these coins. However, it's crucial to recognize that the value can vary based on factors such as the coin's condition, provenance, and market demand at the time of sale.