Actually, the first FOUR presidents - Washinton, Jefferson, Adams, and Madison - were featured in the 2007 Presidential Dollar series. Four presidents will be featured each year until the series ends.
President John F. Kennedy has been featured on the U.S. half dollar since 1964, including 2007.
The United States Mint began circulating dollar coins from the Presidential $1 Coin Program in 2007 until 2011. The front (heads) design featured the portrait of a U.S. president. The back (tails) features the Statue of Liberty.
So far 12 different Presidential dollars. Starting in 2007 and will run to 2016 with 4 issued per year in the order each president served.
What you have is a modern brass $1 coin issued as part of the Presidential Dollar series. If you found it in change it's only worth a dollar. The dates indicate the years that George Washington served as president. The coin's minting date is 2007 and is on the edge.
If you check the back you'll find that you have a halfdollar. There has never been a US-issued Kennedy silver dollar.
It's made of brass, not gold, and is only worth $1. It's a standard circulating coin issued as part of the Presidential Dollar series. Hundreds of millions have been struck. Four designs will be issued every year depicting each president in the order that they held office.
Eisenhower was the first president on a dollar coin from 1971 to 1978. From 2007 to 2011, the first 20 presidents are depicted on the dollar coins.
Actually, Thomas Jefferson has appeared on 3 US coins: the Jefferson nickel first issued in 1938 and continues today, the Jefferson Presidential Dollar issued in 2007 and the Thomas Jefferson 250th Anniversary Dollar issued in 1993.
Most US presidents have never appeared on paper currency. However every US president except those still alive at the time have been or will be featured on the Presidential Dollar Coin series that began in 2007.
Those are the years George Washington was President, so what you have is a 2007 presidential dollar coin. It's worth one dollar.
Washington is currently featured on the $1 bill, the quarter dollar coin, and a $1 coin only minted in 2007. He has also been featured on commemorative coinage, such as a 1982 half dollar, though these weren't for use in circulation.
Again, I assume this is about US money. There are two dollar coins currently in production (but not used much) that are about the size of a quarter. One has Sacagawea on it and was introduced in 2000; the other carries portraits of US presidents in order of their terms in office and was introduced in 2007. The Presidential Dollar series is now minted only for sale to collectors, but those from the first few years may occasionally surface in circulation. At the end of 2012, this series had featured every president from Washington through Cleveland (second term). Before those were introduced, small-size dollars were minted that carried a portrait of Susan B. Anthony. These were issued for circulation only in 1978, 1979, and 1999 and also occasionally turn up in circulation. From 1971 to 1978 a much larger coin, the size of a silver dollar, was used, bearing the profile of President Dwight D. Eisenhower.