Simply put, it is to look at the numbers, because NB shoes are all represented by numbers. Generally speaking, the higher the number, the higher the end. For example, 3 series 373 and 365 are low-end shoes, followed by 4 series 420 and 455. , and then the common 5 series, of which 574 is the most common and has the richest color matching. Then the 576 is relatively high-end, especially the 576 made in Britain, which is a classic. Then there is 580, which has a tendency to go to the middle end in recent years, especially after being made in China. There is also 530. I feel that in the past two years, the main push has been 580 and 530. Further up is 670, all made in Britain, which is relatively small. There are more common and high-end ones, namely 9 series and 1000 series. 990, 993, 996, 997, 998, 999 have their own styles, and their appearances are very different, especially those made in Britain and America (996,999 is made in China, and the price is much lower). Thousands of classic shoes are basically made in Britain and America, such as 1300, 1400, 1500 (made in early years, but basically made in Britain in recent years) and so on. , and 1600 (made in Vietnam) is relatively affordable.