There are no separate sets of U.S. dollars. Strictly speaking, the U.S. dollar is just a general term, generally referring to banknotes issued by the United States.

Historically, there were many types of U.S. dollars, such as gold certificates, silver certificates, National Bank certificates, federal government certificates, Federal Reserve certificates, etc. The common U.S. dollars currently circulating on the market are mainly Federal Reserve Notes, but the U.S. dollars issued since 1928 are legal tender in the United States. So in a broad sense, the previously mentioned gold certificates, silver certificates, national bank certificates, federal government The bonds are still legal tender in the United States and can be circulated as Federal Reserve notes of the same face value.

The U.S. dollar has not been revised as frequently as the RMB. For example, the Federal Reserve notes were issued in 1928 and were not completely revised until 1996. During these 68 years, the color was only slightly modified, but the main design elements remained unchanged. This is what we commonly call a small dollar. The domestic banking system has already failed to redeem small dollar bills (to put it bluntly, it means not accepting them), but this is only a regulation of the domestic banking industry, and this does not happen in the United States.

In 1996, new versions of Federal Reserve Notes began to appear, which are the ones in your picture, commonly known as big dollars.

Since 2004, color versions of Federal Reserve Notes have begun to appear, and U.S. banknotes have bid farewell to the era of black and white photos. . . The 10 yuan coupon was first launched, and other denominations were also launched after that. At present, all color versions of all denominations have been launched (due to printing cost considerations, there are no color versions and front pages for the 1 yuan and 2 yuan denominations)

The United Kingdom is not a single currency country. It is a currency system composed of the English pound, the Scottish pound, the Northern Ireland pound, the Isle of Man pound, the Guernsey pound and the Jersey pound. These pounds are all currencies of the United Kingdom and can circulate with equal value to each other in the United Kingdom.

But in China, the pound refers to the English pound, and domestic banks do not recognize other pounds, so we only talk about the English pound. The British pound has been issued in the G series (that is, the G version), but it has not yet been fully issued. Currently, the G series only has two denominations of 5 pounds and 10 pounds, which are plastic banknotes. The ￡20 and ￡50 notes will be issued in succession over the next few years.

From the time the new king ascends the throne, pounds sterling with his face will be released. The first version is called A-series pounds. After that, it will be revised every few years to deal with counterfeit banknotes. After the revision, it will be called B-series banknotes, and then it will be called series B. The revised version is called C sequence, and it goes down in sequence until the king dies and a new king ascends the throne to start a new cycle.

There is a saying that the pound will be invalidated, but it has appeared three times in history.

The first time was after the end of World War II, the United Kingdom announced that several pound banknotes with denominations would be recycled within a time limit and become invalid after the expiration date. This was because Nazi Germany counterfeited pounds with these denominations during World War II, and the forgery was very serious. success.

The other time was when the British currency changed to decimal system in 1971, that is, 1 pound = 100. The previously issued pounds, shillings, crowns, florins, and old pennies became invalid.

British currency was very complicated before the currency reform. For example, 1 pound = 20 shillings, 1 shilling = 12 pence, 5 shillings = 1 crown, 1 florin = 2 Penny, at that time foreigners would really be fooled by all kinds of money when they came to the UK. Therefore, in 1971, the United Kingdom gave up its tradition and started to simplify the relationship between the pound and its subsidiary currencies in line with the world trend. It canceled the three currency units of shilling, krona and florin. Therefore, the previously issued pound sterling was invalidated after the expiration date.

The last one was a 1 pound coin. It is said that there are more fakes than real ones, so the UK announced the issuance of a new 1 pound coin, and all previous 1 pound coins with various designs were invalid