Type "Souvenir dollar replica coins" to google and you will find plenty of choice. Some have a silver gloss and are said to be sterling silver plated on brass. Most replicas are Morgan dollars, since demand is high and the reeded edge facilitates production.
NGCOIN explorer mentions this on the 1804 draped bust dollar
"One of the most famous coins ever struck is considered a part of the Draped Bust series—the 1804 dollar. While the Mint struck dollars in 1804, all were produced from leftover dies dated 1802 and 1803, and no dollars were struck with the date 1804. However, thirty years later when several presentation sets of U.S. coins were needed for diplomatic gifts, the Draped Bust design was resurrected and dated 1804, as that was the last year the dollar coin had been struck. These were the so-called “original” or Class I 1804 dollars. The Class II and Class III 1804 “restrikes” were produced in the late 1850s for prominent collectors of the day. Only 15 specimens are known of all three types.
No true proofs are known from this series but, as with the 1804 dollar, Mint officials were only too pleased to oblige collectors in later years. During the 1870s modern looking proof dollars appeared with the dates 1801, 1802 and 1803. These fantasy pieces are highly prized by collectors."
Complete text:
https://www.ngccoin.com/coin-explorer/early-dollars-1794-1804-pscid-45