Common metal challenge coins are divided into general coins and refined coins. Ordinary challenge coins are mainly designed and minted with themes of major Chinese and foreign events, festivals, anniversaries and rare animals. It is a legal currency issued by the state that can be circulated but has commemorative significance. After issuance, it can be circulated at the same value as the circulating renminbi, and its denomination is recorded in the market cash circulation and becomes a part of the money supply.
However, the circulation challenge currency is not only a pure currency, but also a currency specially issued to commemorate an important theme. Therefore, it must be of commemorative significance. This commemorative meaning must be fully expressed through the meaning of the pattern and the expression of the text.
In the choice of subject matter, the circulation challenge coin highlights the key points and forms a series of its own. As far as themes are concerned, it highlights major historical events, outstanding figures and particularly important realities. These challenge coins also constitute a series, such as the Great Man series, the National Day series, the sports series, the autonomous region establishment series, the special administrative region establishment series, and the rare animal series.
As a special commodity serving as a general equivalent, the challenge coin also has a high collection, value preservation and investment value.