In the context of collectible coins, patterns and trial coins are two significant types. Patterns refer to experimental designs created to test new concepts for coinage, often struck in small numbers and not meant for circulation. The 1977 one dollar trial coins in the United States, for example, represent a unique aspect of numismatic history, showcasing designs that may not have gone into full production but still hold significant value to collectors. Collecting such items involves understanding both their aesthetic appeal and historical significance.

Item Denomination Series Year Mint
1977-- (Unknown) Patterns & Trial Coins $1 (One Dollar) Patterns & Trial Coins 1977 Unknown
1977-- (Unknown) Patterns & Trial Coins $1 (One Dollar) Patterns & Trial Coins 1977 Unknown