The 1956 Denver quarter is a collectible coin that belongs to the Washington quarter series, which was first issued in 1932 to commemorate the 200th anniversary of George Washington's birth. Struck at the Denver Mint, this quarter features a portrait of George Washington on the obverse and an eagle on the reverse. The 1956-D quarter is popular among collectors due to its historical significance and relatively high mintage, making it a common find in circulation. In uncirculated condition, it holds more value among numismatists, especially if found within original mint packaging, such as a 25c roll.