K11 Factory Cartier TANK Watch Compared with genuine reviews and Cartier watches, many people first think of the Blue Balloon. Its unique design is especially popular among couples. In fact, although Cartier TANK is not as popular as the Blue Balloon, its rectangular design is also very recognizable. In addition, there are many entry-level styles, and the public prices are relatively cheap. It has also won the love of many watch fans. Popularity. This is naturally followed by many factories in the replica watch industry, and K11 factory is one of them. As a factory that fights back from the bottom, K11 Factory relies on a down-to-earth attitude and love for research. Its products can’t be said to be perfect, at least they definitely don’t look like fakes.