Collectible coins, such as the 1990 Philadelphia Washington Quarter (25c), are valued for their historical significance, rarity, and condition. The Washington Quarter series, first issued in 1932, features the bust of George Washington and has various mint marks indicating where they were produced. The Philadelphia mint mark is typically unmarked, while coins from other mints, like Denver or San Francisco, will have distinct letters. Collectors may seek out uncirculated or proof examples from 1990 to enhance their collections, considering factors like mintage numbers and collector demand.

Item Denomination Series Year Mint
1990-P 25c 25c Washington Quarters 1990 Philadelphia