The upgraded Hublot Big Bang 421 (A42 Version) by LS Factory — a breakthrough sports chronograph built for bold, rugged style. Lightweight 44 mm case, skeleton open‑worked dial and iconic Big Bang design, available in multiple eye‑catching finishes. Case & Construction • Case diameter: 44mm, ergonomic build, lightweight and comfortable for all‑day wear • Premium high‑performance case finishes: black ceramic, brushed steel, matte blue, military green, khaki and two‑tone variants • Scratch‑resistant sapphire crystal • Signature exposed‑screw bezel, faithfully reproduced original Big Bang silhouette Dial • Open‑work skeleton dial with visible mechanical details • Clear printed chronograph scales, "FLYBACK" marking and distinctive oversized numerals • Color‑matched hands and sub‑dial accents for each case variant Movement • Custom HUB 1280 automatic chronograph movement • Reliable automatic winding, full chronograph functions, smooth operation Strap • Woven texture rubber strap with one‑click quick release • Easy strap swap; robust, sporty and comfortable on the wrist
Specifications
| Case Material | Stainless Steel |
| Strap Material | Metal |
| Crystal Material | Sapphire Glass |
| Dial Material | Metal |
| Movement | Mechanical |
| Function Features | Complicated |
| Target Group | Men |
