At 42mm, this replica square bang 42mm in reference 821.NX.0170.RX represents the titanium expression of the Square Bang Unico platform. The NX designation identifies the case material as titanium, bringing the lightest wrist feel among the metal variants in this collection. Hublot introduced the Square Bang to challenge the dominance of round sport chronographs, and the titanium version sharpens that challenge by removing weight as a barrier to all-day wear.

Build Details

• Case diameter: 42mm square cushion
• Reference: 821.NX.0170.RX
• Case material: titanium with satin and polished finishing
• Bezel: titanium with H-shaped screws
• Crystal: sapphire flat with AR coating
• Movement: Unico automatic chronograph
• Functions: chronograph, date, flyback
• Strap: titanium-toned rubber with deployment buckle

Titanium’s natural grey tone gives the 821.NX a cooler, more industrial appearance compared to the warmer tones seen on the King Gold references in the same lineup.

What Collectors Notice

The titanium Square Bang occupies an interesting position: it has the most aggressive case design in Hublot’s current catalog but wears lighter than most traditional round chronographs. Collectors who have handled both the titanium and King Gold versions consistently note the dramatic difference in wrist presence despite identical dimensions. The satin-finished flat surfaces on titanium show brushing patterns more prominently than denser metals, giving each panel a visible grain direction. Pair this against the 821.OM.0180.RX in King Gold and the weight and color contrast is striking. Both sit in the Square Bang catalog with the same Unico engine under completely different material identities.

This vs Other Versions

Titanium on a square case amplifies the tool-watch characteristics while gold versions push toward luxury territory. The NX variant reads as the performance-oriented Square Bang, the one you reach for when function matters more than flash. The lighter mass also affects how the chronograph pushers feel under thumb pressure, with less inertia in the case itself. This replica square bang 42mm in titanium offers the purest expression of the collection’s architectural intent without the material weight that changes how the watch moves on your wrist.