Hublot Big Bang 421.NL.5170.RX 44 mm Blue Dial

The 421.NL.5170.RX builds its Big Bang Unico identity around a cool material contrast: a 44 mm titanium case, a blue ceramic bezel, and a blue rubber strap. Polished and satin case surfaces meet a microblasted bezel, giving the blue accents different textures rather than a single uninterrupted tone. The sapphire crystal is anti-reflective, the dial is satin-finished, and the 100-metre rating supports the watch's active chronograph profile. Pushers and a screw-down crown complete a purposeful arrangement.

Its automatic HUB1280 is an in-house Unico movement with a column-wheel chronograph and flyback function. A date display sits alongside the timing indications, while the full rotor winds a 72-hour reserve. The calibre contains 43 jewels and 354 parts. In this reference, titanium supplies the light case foundation, blue ceramic provides the visual focus, and the movement gives the bold exterior a substantial mechanical centre.