This replica square bang 0170 pairs a 42mm angular case with the 821.NM.0170.RX reference designation, placing it in the black magic material family within the Square Bang Unico lineup. The NM code indicates a treatment that combines dark tonality with a distinct material feel compared to the standard finishes. Hublot built the Square Bang around the idea that watches can be architectural objects, and this reference leans into that philosophy with a restrained color palette that lets the geometry speak for itself.

Key Specifications

• Case diameter: 42mm square cushion
• Reference: 821.NM.0170.RX
• Case construction: angular with integrated lugs
• Bezel: fixed with signature H-shaped titanium screws
• Crystal: sapphire with anti-reflective treatment
• Movement: Unico automatic chronograph caliber
• Functions: chronograph, date, flyback
• Strap: rubber with folding clasp

The NM material designation gives this version a surface character that differs from both the polished HX variants and the fully satin-finished NX models in the range.

Design & Finishing

The squared cushion shape creates four distinct planes on each case side, each finished with deliberate transitions between brushed and polished zones. From the front the watch reads as a bold geometric statement, but the side profile reveals thinner proportions than the face suggests. The integrated lugs flow directly into the rubber strap attachment without the curved bridge typical of round-cased chronographs. That direct angular connection reinforces the architectural intent. Set this next to the 821.NX.0170.RX in titanium and you see how much material finish changes the personality of identical case geometry. The full Square Bang range demonstrates this principle across every variant.

On the Wrist

Despite the square footprint, the 42mm case wears closer to a 40mm round watch in terms of lug-to-lug distance. The structured rubber strap conforms to the wrist quickly without the break-in period that stiffer bracelet options sometimes require. The overall visual impact is bold but not oversized, landing in a zone that works with both casual and semi-formal fits. This replica square bang 0170 handles the rare trick of looking dramatic in photos while wearing comfortably understated on the wrist.