Hublot Big Bang Meca-10 42 mm

Big Bang Meca-10 is a line of wristwatches from Hublot.

Unlike the well-known chronographs in the Big Bang line, this series—first launched in 2016—features hand-wound watches. On the one hand, they attract attention with spectacular views of the movement from both the front and the back; on the other hand, they also feature a very long power reserve of 10 days and a power reserve indicator.

This indicator is driven by a “Crémaillère” rack-and-pinion system—a rarity in mechanical watches—in which a rack meshes with a spur gear to produce linear motion. Upon closer inspection, this system proves to be more subtle than it might seem at first glance. It consists of two discs stacked one above the other, which rotate in opposite directions and are connected by a spiral spring that is wound in the center, much like the mainspring. This creates an extremely unusual differential display that is nonetheless intuitive to read.

The case is made of titanium, a lightweight yet highly durable metal that gives the watches a modern look. Variants are also available in King Gold and black ceramic.

In 2025, the series was released with a case reduced in size from 45 mm to 42 mm and an optimized movement.