Collectible coins encompass a variety of genres, including commemorative pieces, bullion, and historical coins. In the United States, the Two and a Half Dollar (or Quarter Eagle) was minted for circulation, with notable issues such as the 1831 patterns and trial coins. These prototype coins were struck in Philadelphia, aimed at evaluating designs or compositions before standard production. The rarity and historical significance of these pieces often elevate their value among collectors.

Item Denomination Series Year Mint
United States of America 1831 Philadelphia Patterns & Trial Coins $2.50 $2.50 (Two and a Half Dollars) Patterns & Trial Coins 1831 Philadelphia