Please check again and post a new question. Your dates and mint mark notation do not agree with any known U.S. coin for the following reasons:
> The U.S. did not mint any silver dollars for circulation between 1804 and 1835.
> The first branch mint was established in 1838 so no coins before that date would carry a mint mark.
> There is no "os" mint mark. The New Orleans mint (O) was established in 1838. The San Francisco mint (S) opened in 1854.
Note that the market is flooded with counterfeit dollar coins, most made in the Far East and of varying quality. Many are very good, but some are laughably bad with impossible dates and designs. It's possible you have one of the latter.
By the mint mark on the reverse of the coin, but silver dollar coins with no mint mark are made in Philadelphia
No mint mark means it was minted in Philadelphia.
The mint mark on any Morgan dollar is on the reverse above the letters DO in dollar.
No mint mark indicates that it was made in Philadelphia.
If there's no mint mark, then it was minted in Philadelphia.
The mint mark (if it has one) on all Morgan silver dollars is on the reverse of the coin just above the letters "DO" in dollar.
No mint mark means the coin was minted in Philadelphia.
Not always, no. If it was minted in Philadelphia, then there is no mint mark.
above the DO in dollar on the back :]
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"DO" isn't a mint mark. The mint mark on a silver dollar for that year is on the reverse (tails) side, just above the letters "do" in the word "dollar."
No mint mark indicates that the coin was minted in Philadelphia.