You have what's called a "Barber" quarter, after its designer Charles Barber. A 1903-S mint quarter is somewhat valuable; retail prices range from $13 or so if very worn, to $40 if moderately worn, and up to about $100 in like-new condition.
1984 Silver eagle from Sunshine Mine .999
Butler Eagle was created in 1903.
Pretty Eagle died in 1903.
Coventry-Eagle was created in 1903.
8-13-11>> In circulated condition the coin has values from $420.00-$520.00 depending on the actual grade. A 1903 Quarter Eagle is a common $5 gold coin.
1903 is not a rare year (regardless of mintmark) and if in average circulated condition it is worth about $6 for the silver. If in better condition it can be worth quite a bit, but if it is fairly worn, a collector will really only give you melt for it.
Eagle Salt Works Railroad was created in 1903.
Silver averaged about US$ 0.56 per troy ounce in 1903 (http://www.goldmastersusa.com/silver_historical_prices.asp).
Under the Mistletoe - 1903 was released on: USA: December 1903
Current retail value for a Liberty Head 1903 Double Eagle is $1,490.00 in the grade of MS-60
$3.00- $2,750.00 dollars
It's a common misunderstanding that old silver dollars were called American Eagle dollars. In fact, your coin is called a Morgan dollar after its designer George T. Morgan. It was minted for spending in ordinary commerce. On the other hand, American Eagle "dollars" are 1 oz silver bullion coins minted since 1986 for sale to investors and collectors. They're not circulating coins and the $1 denomination is artificial. Please see the Related Question for more information.