This replica square bang 0180 presents the 821.OX.0180.RX reference, which takes the King Gold Square Bang Unico and applies a full polished finish across the 42mm angular case. Where the satin OM variant downplays its precious-metal identity, the OX version puts King Gold front and center with mirror-polished surfaces that catch light across every flat plane. Hublot’s proprietary red gold alloy combined with the squared-off geometry creates something between a luxury dress piece and an avant-garde sport chronograph.

Case & Movement Specs

• Case diameter: 42mm square cushion
• Reference: 821.OX.0180.RX
• Case material: King Gold (proprietary red gold alloy), polished
• Bezel: polished King Gold with H-shaped screws
• Crystal: sapphire with AR coating
• Movement: Unico automatic column-wheel chronograph
• Functions: chronograph, date, flyback
• Strap: rubber with gold-tone deployment clasp

The polished treatment on flat square surfaces produces broader reflections than on round cases. Each side panel acts like a small mirror, creating sharp light-dark transitions along the edges rather than the gradual roll-off seen on curved cases.

Caliber Breakdown

The Unico movement inside the OX shares its column-wheel architecture and flyback function with every Square Bang variant. The chronograph bridge and coupling clicks remain visible through the partially skeletonized dial. Through the caseback the King Gold rotor adds a warm metallic frame around the movement plates, something exclusive to the precious-metal references. For a different material interpretation, compare this with the 821.HX.0170.RX, which houses the identical Unico engine in a lighter, cooler-toned case. The full Square Bang lineup shows how one mechanical foundation supports material stories from titanium to King Gold.

How It Compares

Polished gold on angular surfaces is a polarizing choice. It maximizes visual impact at the cost of showing fingerprints more readily than satin alternatives. The 821.OX wears heavier than the NX titanium version, and that weight combines with the high-polish finish to create the most luxurious expression within the Square Bang catalog. On the wrist the squared corners sit inside the lug span comfortably, but polished gold ensures this piece never blends into the background. This replica square bang 0180 in polished King Gold represents the maximum-impact version for those who want architectural design without restraint in material expression.