Hublot, Big Bang series, model: 421.NX.2010.LR.JPN, a Japanese limited edition of titanium openwork Big explosion. The entire watch is made of matte titanium, which is lightweight and wear-resistant. The 44mm fully openwork dial reveals the mechanical beauty at a glance. It features luminous hour markers, dual small dial chronograph function, date display, and a fixed titanium bezel decorated with H screws. Equipped with the self-produced HUB1280 automatic movement with a transparent back and a titanium folding clasp.