Hublot Spirit of Big Bang 665.NX.1170.RX.1204 Black Dial 39mm

The Hublot Spirit of Big Bang 665.NX.1170.RX.1204 is a 39mm titanium watch with a black dial, diamond-set bezel and a black structured rubber strap. Its tonneau-shaped case gives it a stronger visual identity than a conventional round watch, while the smaller diameter makes it considerably easier to wear than many larger Spirit of Big Bang models.

The black dial keeps the overall appearance controlled, but the openworked construction and diamond bezel prevent it from becoming understated. This is a modern sports-luxury watch for someone who wants visible mechanical detail and a noticeable case shape without wearing an oversized 45mm model.

Black Dial, Diamond Bezel

The matte black dial absorbs much of the surrounding light, which helps the polished hands and exposed mechanical elements stand out. In strong daylight, the skeleton structure becomes easier to study, with the bridges, wheels and openings creating depth beneath the sapphire crystal. In softer indoor lighting, the dial becomes darker and more unified, allowing the diamonds around the bezel to become the primary source of sparkle.

The stones are not the only decorative feature, but they do change the balance of the watch. The titanium case and black dial suggest a technical sports watch, while the diamond bezel introduces a more refined and evening-oriented character. This combination works for buyers who dislike overly bright gold watches but still want a clear jewellery element. It may feel too decorative for someone looking for a pure tool-style watch, particularly because the bezel attracts attention from almost every angle.

Why 39mm Matters?

The Spirit of Big Bang 39mm case is one of the most practical aspects of this configuration. The tonneau shape makes the watch look larger than a 39mm round case, but the reduced diameter keeps it from overwhelming the wrist. The curved sides and integrated strap help the case follow the arm naturally, making it easier to wear for long periods than the larger versions of the collection.

Titanium also reduces the physical weight, although the case still has enough height and structure to feel like a serious mechanical watch. On a medium wrist, the proportions appear balanced rather than delicate. On a smaller wrist, it remains distinctive but should still sit comfortably if the strap is correctly adjusted. Buyers who want the Spirit of Big Bang design but find 42mm or 45mm watches excessive will likely prefer this size.

The Open worked Display

The skeletonised dial is designed to be examined rather than read at a glance. The visible movement gives the watch an animated appearance, especially when the balance and gears catch the light as the wrist moves. The hands remain clear enough for ordinary timekeeping, but the dial is more visually involved than a conventional black three-hand watch.

This configuration is better suited to someone who enjoys mechanical watches as objects of construction. The openworked layout gives the watch depth that photographs cannot fully show, although strong reflections on the sapphire crystal may occasionally obscure smaller details. That is a normal compromise with skeleton dials. The visual reward is a watch that looks different in changing light, but the display will never be as immediately calm as a solid dial.

The Structured Rubber Strap

The black lined rubber strap keeps the watch sporty and prevents the diamond bezel from making it feel too formal. It conforms to the wrist more easily than a rigid bracelet and works well with casual clothing, travel wear and evening outfits that do not require a traditional dress watch. The integrated design also makes the case appear more continuous, with fewer visual breaks between the strap and the tonneau body.

Rubber is practical, but it gives the watch a more contemporary character than leather would. Buyers who want a softer, more traditional appearance may prefer a leather-strapped configuration, while those who expect to wear the watch regularly will appreciate the flexibility and resistance of rubber. The strap also helps balance the bezel by bringing the watch back toward a sports-watch feel.

Everyday Use and Water

The 100-metre water-resistance rating provides useful protection for daily wear, light swimming and ordinary exposure to water, although this should not be treated as a dedicated diving watch. The titanium case is comfortable for extended use, but the polished sections and diamond-set bezel still require care around hard surfaces. The watch is best worn with awareness rather than treated as an indestructible sports instrument.

The HUB1710 self-winding movement provides approximately 50 hours of power reserve, and the openworked construction allows the mechanical operation to remain part of the experience. However, the real appeal of this reference is not technical capacity alone. It is the combination of a wearable 39mm size, black-and-titanium contrast, visible movement and diamond detailing.

Who This Reference Fits?

The Hublot Spirit of Big Bang 665.NX.1170.RX.1204 suits a buyer who wants a distinctive luxury watch with a strong case shape but does not want the physical scale of a larger Spirit of Big Bang. It works particularly well for someone who appreciates openworked dials, black watches and diamonds used as a controlled detail rather than as the entire visual focus.

It is less suitable for someone looking for a discreet office watch, a traditional round case or completely effortless legibility. The watch is designed to be noticed and examined. One reference point should be verified before publishing: Hublot’s official listing for the closely matching 39mm titanium diamond configuration uses reference 662.NX.1170.RX.1204, while several marketplace sources identify 665.NX.1170.RX.1204. The caseback and papers should confirm the exact number