Ctf is the first letter of Chow Tai Fook's English name Chow Tai Fook, and 2 stands for the second generation. I don't know why your name is Zhou Dasheng. In addition, pure gold B is generally a product sub-cabinet or category, and can also be the code of different factories or production departments. Generally speaking, this CTF gold B is the number given to this ring by the manufacturer.