Hello! Let's start with the coin "Five Kings". The "Five Heavenly Kings" are 15 cents issued by 198 1, 52 cents issued by 1980 and 50 cents issued by 1979 respectively. Because the circulation of coins with these year numbers is very small, they are only made to meet the needs of tourists to buy souvenirs of China coins. These coins are bound and sold in foreign exchange shops, and the buyers are usually foreigners. Because they are not in circulation in the market, these five kinds of coins can hardly be found in the domestic market now, and collectors call them "Five Kings". At present, the collection price of the "Five Heavenly Kings" is relatively high, and its market price has reached about 8,000 yuan.

Besides, I don't know what you mean by "small five treasures of coins". Friends in our circle usually refer to the modified products (fakes) of the "Five Kings" as "Little Five Treasures". This kind of coin is made of 1, 2, and 5 cents of other years. By digging, filling, and grinding, the year number is transformed into the "Five Kings", reaching the point of confusing the fake with the real. I have a set of "Little Five Treasures", which I bought in the collection market 15 yuan six years ago. The level of reorganization is so high that most people can't see it with the naked eye. However, this small five-treasure coin is easy to identify with a magnifying glass, and collectors should not be deceived.

I hope you will be satisfied with my answer, thank you!