1. What is a large code-a large code refers to the part where the number is above 5 after the fourth digit of the serial number of a banknote. For example, the fourth set of 80-year-old RMB 1 yuan, its packaging is bundled into one for every five. Under normal circumstances, a package with the last four digits of 5,000 sheets as xxxx5001-xxxx0000 is one. This is called large in the collection market;

2. What is a trumpet? Trumpet refers to the part where the number after the fourth digit of the serial number of paper money is below 5. For example, the fourth set of 80-year-old RMB 1 yuan, its packaging is bundled into one for every five. Under normal circumstances, a package with the last four digits of 5,000 sheets as xxxx001-xxxx5000 is one. This article is called the trumpet of the collection market;

3. Plate cutting-Plate cutting refers to the paper money cut into a single sheet with conjoined banknotes. This usually happens when the price of conjoined banknotes is lower than the original single sheet. For example, in the 50 yuan edition in the 1980s, there were many clippings in the collection market, which were used to replace the original leaflets and put them in the collection books to deceive people who didn't know much about banknote collection (the cut conjoined banknotes were "residual coins" and had low collection value).

I hope this helps.

Good luck in your career, haha