Collectible coins include a variety of types such as patterns, trial coins, and commemoratives. The United States quarter, specifically the 25 cents coin, has had numerous designs and variations over its history, including notable issues like the 1965 trial coins which were produced during a transition period in U.S. coinage. Unknown or rare prototypes may also exist, depicting unique designs that were never released for general circulation, often sought after by collectors for their historical significance and limited availability.

Item Denomination Series Year Mint
1965-- (Unknown) Patterns & Trial Coins 25¢ (Twenty Five Cents, Quarter) Patterns & Trial Coins 1965 Unknown