"Although this 'Four-eyed Da Qi' coin has never been exhibited, it is now indeed preserved in the Dai Jitao Foundation. This once again explains the fate between Da Qi Tong Bao and the Dai family."

"As for the second mistake, it is that there are not three authentic Da Qi Tong Bao coins discovered now, but four. About ten years ago, a Da Qi Tong Bao named 'Green Rust Da Qi' reappeared and has been proven to be authentic. It is also different from any Da Qi Tong Bao that has appeared before. Now it can be confirmed to be the fourth authentic Da Qi Tong Bao to be discovered."

"It is said that this coin was unearthed at a site close to the 'Blue Rust Da Qi', at a Tang and Song Dynasty site, with dozens of kilograms of coins stored in jars, including coins from the Tang, Five Dynasties, and Song Dynasties, mostly Northern Song Dynasty coins and Kaiyuan coins, and no coins from the late Northern Song Dynasty and the Southern Song Dynasty. It is also reported that treasures such as Qianfeng Quanbao, Xiantong Xuanbao, Qianheng Tongbao, and Guangzheng Tongbao have been unearthed here. It can be inferred that this batch of coins should be stored in the Northern Song Dynasty. This should be another major discovery in the history of numismatics and currency in my country. The unearthed and discovered two authentic 'Da Qi Tong Bao' coins have made everyone affirm the existence of the 'Da Qi Tong Bao' coins, and the research and understanding of the 'Da Qi Tong Bao' has not only stopped at two incomplete rubbings, but has truly moved towards physical research."

After a pause, Mr. Liu looked at the freshly minted Da Qi Tong Bao in his hand and said with a smile: "If you count this one, there are already five Da Qi Tong Bao in the world. Xiao Zhao, you still need to lay a solid foundation for your basic knowledge! Your spirituality is good, but it is still a little rough. You need to calm down and hone your skills, read more, ask more, and get started more. Don't believe everything you hear. Only in this way can you go further in this industry!"

"Yes, teacher, I remember it!" Xiao Zhao answered respectfully.

"Well, we still have 34 unprocessed ancient coins here, and I don't know what's covered under the copper rust. But I can tell you that Director Cai and I just brushed out two ancient coins, and we found this Da Qi Tong Bao and a Da Xia Zhen Xing, both of which are very rare! So, kids, I'll give you a chance to practice. You two will form a group, each responsible for four ancient coins, and clean them out!"

The students immediately cheered excitedly.

This kind of opportunity is really rare...