I bought some platinum at the counter of Chow Tai Fook. I found a b on it. I asked the teller that it was produced by factory B, and later I saw the same model in Baohengda.
Chow Tai Fook did not have its own factory. It is manufactured by other factories, but some styles can't be provided to other customers after buying out the factory. This is not a question of interest. The whole industry is like this. Consumers value brands, and everyone in the industry knows that they are actually different brands posted by the same factory.