The 1978 D Washington Quarter is a valuable collector coin made of a clad composition in the United States. This  coin was minted in Denver and features a business strike type. It is ungraded and uncertified by the U.S. Mint, making it a desirable piece for collectors interested in US coins from the late 1970s. With its 25 cents denomination and historical significance, this Washington Quarter is a prized addition to any coin collection.