Cartier Tank Crocodile Leather Genuine Small Size Watch, Diameter 31mm, 24mm Swiss Quartz Movement, 36 VS1.1 Genuine Diamonds, Authentically Certified by China's GTC Testing Agency. Previously, the quality of our standard leather Tank watches was well recognized, and in response to requests from high-end clients, we have released a high-end version with genuine crocodile leather. The accessories and movement have also been meticulously sourced. The Cartier Tank series wristwatch was first born in 1917, with its design concept inspired by the parallel facets of the French Renault tank and the track-shaped design evolved from tank treads, complemented by Roman numeral hour markers, creating a vintage yet understated elegance. The current version is already the top configuration on the market. Some professional watch enthusiasts can see the differences in detail; the genuine product is completely dismantled and molded, using the original factory movement, genuine imported crocodile leather. This high-end luxury piece is one of the major works concluding this year, 2018.What are the differences between the top-tier version and the genuine product and market goods, and why is there such a price disparity? The answer is simple: costs arise from precisely crafted components to the movement, and any overlooked aspect can save costs in ways you can't imagine. For example, movements can range from 10 or 20 yuan to hundreds or even thousands. We exclusively use imported Swiss quartz movements. The market's imitation watches often focus solely on appearance, so on a superficial level, they may appear convincing with domestic movements. This is where the unseen details come into play. Every component we use has precise specifications, ensuring that the case back corresponds to a unique factory code. Furthermore, the stones we use are genuine and not misleading; we have testing certificates from authoritative national inspection agencies, and we support retesting.