This replica big bang 1170 45mm pairs the Unico chronograph architecture with a factory-set diamond bezel on a stainless steel case, carrying reference 441.RX.1170.RX.1704. The 1704 designation in the reference signals the diamond configuration, and here they sit in a single row around the bezel perimeter, framing the skeletal Unico dial. Hublot positioned the Big Bang Unico as the in-house movement flagship, and adding diamonds to that mechanical showcase creates a deliberate tension between technical watchmaking and jewelry.

Build Details

• Case diameter: 45mm
• Case material: polished stainless steel
• Bezel: stainless steel with factory-set diamonds
• Crystal: sapphire, anti-reflective
• Dial: skeletal with visible Unico movement components
• Strap: black rubber with steel deployment clasp
• Movement: Unico automatic flyback chronograph
• Functions: hours, minutes, flyback chronograph, date, column wheel visible at 6 o’clock

The skeleton dial exposes the column wheel mechanism at 6 o’clock and the chronograph coupling at 12, giving a direct view of the movement architecture. Date sits in a window between 4 and 5 o’clock.

What Collectors Notice

The Unico caliber remains one of the few in-house movements in this price segment that uses a visible column wheel chronograph. That mechanical transparency separates the Unico series from the standard Big Bang chronographs, which use more conventional movement bases. The diamond bezel adds roughly 1mm of visual height to the profile, which collectors familiar with the non-diamond version will spot immediately. For a comparison within the same family, the king gold 441.OX.1180.RX.1704 swaps steel for 18K gold while keeping the same diamond layout. Both are part of the broader Big Bang range, but the material choice between steel and gold shifts the entire character.

This vs Other Versions

Against the plain-bezel Unico references, the 1704 diamond variant aims at buyers who want mechanical credibility and visual luxury simultaneously. The skeleton dial says “watchmaker” while the diamond bezel says “jeweler.” That duality is intentional and has been a consistent thread through the Big Bang line since its early years. This replica big bang 1170 45mm captures that combination in a steel case that reads less formal than the king gold equivalent while still carrying serious wrist presence.