Hbf Factory V2 Version Hublot Big Bang Courageous Chronograph, referred to as HUB. The case is made of imported 316 stainless steel with an explosive design. It features the modified 7750 HUB1242 automatic movement, offering instant chronograph start and one button flyback, perfectly replicating the original functions. The second weight automatic rotor enhances stability and ensures an ultra low repair rate. The watch is equipped with a natural rubber strap that provides exceptional waterproofing, while the dial is made of natural sapphire glass, which is scratch resistant, durable, and flawless. As a young brand, Hublot infuses youthful energy into high end manufacturing with its bold personality and unique designs, allowing everyone to experience the freedom of youth together.