Check the listing for details. 2004-S Wisconsin State Quarter PROOF 25cent Coin from US Mint Proof Set. Listed at 4.75 USD. This 2004-S Wisconsin State Quarter PROOF 25cent Coin from US Mint Proof Set is a great addition to any coin collection. With its copper composition, this Uncirculated coin features a striking Proof strike type and has not been modified in any way. The coin comes with certification from the U.S. Mint and is a single coin from the State Quarters collection, specifically the Wisconsin variety. This San Francisco-minted coin is a great representation of the State Quarters program, which was a 10-year initiative by the U.S. Mint to release five new quarters each year, each representing a different state in the U.S. The Wisconsin coin features a cow, a wheel of cheese, and an ear of corn, all symbols of the state's agriculture industry. Add this beautiful coin to your collection today!