A proof coin is not mass produced. It is individually pressed using polished dies.
Most likely, if you found the (presidential or Sacajawea) coin in change, it is simply in mint state (or more likely about uncirculated). If your coin has an "S" mintmark, it is proof because I don't believe that the San Fransisco mint makes non-proof coinage. If your coin has a "P" or "D" mintmark it is not proof but simply just in mint state or about uncirculated. If you have a silver eagle dollar (the coin is much larger than a presidential dollar) dated 2011, it is uncirculated because at the time of writing, proof 2011 silver eagles have not been released yet.
A 2006-W American Eagle bullion gold coin is worth in an uncirculated state: $90.00; should this coin be in a proof state, its value is: $125.
If it's not proof or a very high mint state coin, it's face value
The dollor is worth a dollar, unless it's a high grade Mint State coin or Proof coin
If it's not proof or a very high mint state coin, it's face value
A Proof coin is a particular issue of a coin not a grade of condition.
Mint State - Same as Uncirculated. A coin free of any trace of wear. Proofs - Coins struck for collectors using specially polished dies.
It depends on the coins date and mintmark. Modern DCAM Proof coins are very common and so are Mint State coins.
Unless it's a Proof or Mint State coin, it's face value.
If you mean a 2005s proof California state quarter retail is $1.10
A proof grade can not be given to a uncirculated (Mint state) coin. The term Proof is actually refers to a method of manufacturing, not a grade. But proof coins are identified by the by a prefix of PF before the grade and mint state are MS
the 3 coin proof set with 2 silver proof one dollar coins and one 10 dollar proof gold coin is worth about $550.00 retail the 3 coin proof set with 2 silver proof one dollar coins and one 10 dollar proof gold coin is worth about $550.00 retail