What denomination? What mint mark? What condition? What country?
Please post a new question with those details.
There were no dollar coins minted in 1909. If you have a dollar coin with a 1909 date on it, it is either a fantasy coin, silver round, or most likely a Chinese counterfeit -- I have seen many of these. In any case, its value will be only for whatever silver it may contain.
No such US coin exists. Silver dollars were not minted from 1905-1920.
It's impossible to say for certain, as the question omits the coin's denomination. A silver coin for that year could be a threepence, sixpence, shilling, florin, or half crown.
what is the value for an American 1909 silver dime
The value of a silver coin is always changing because the value of silver is always changing. See the related link below for a silver coin value calculator. This does not give the actual value of the coin but it does give the value of the metal used to make the coin. This is know as the melt value.
Metal value depends on the purity of the silver and the weight of the coin. Numismatic value depends on the condition of the coin.
The last year an "O" Mintmark was used on any US coin was 1909 and no silver dollars were made after 1935. Look at the coin again and post new question.
The US has never made a silver one cent coin (it may have been plated) and the first year for wheat cents was 1909. Look at the coin again and post new question.
The value of a 1909 US silver quarter depends on its condition and rarity. As a general guideline, a circulated 1909 US silver quarter might be worth around $5 to $10, while a well-preserved uncirculated coin could be valued between $25 and $50. However, for an accurate valuation, it is recommended to consult a professional coin dealer or appraiser.
A Silver Eagle Bullion coin is 99.9% pure silver and weighs 1 oz per coin. The stamped value of the coin is U.S$1 however the intrinsic value of the coin is the value of the silver within that coin. If the the spot price of silver was $30oz at the time of checking, then the value of that coin would be worth at least $30 or more.
The value of an uncirculated 1999 Silver American Eagle Littleton coin fluctuates based on the market for silver. However, a coin can be expected to have a value of about $40.
This coin is most likely worth the silver value.