This replica big bang om carries the 411.OM.1180.RX reference, a 45mm Big Bang Unico in Hublot’s proprietary King Gold alloy paired with a black rubber strap. King Gold is the brand’s in-house 18K red gold formulation that adds platinum to the alloy mix for improved oxidation resistance and a warmer tone than standard rose gold. The “O” in the reference code identifies the gold case material while “M” denotes the micro-blasted surface treatment. At 45mm this is a full-size Unico chronograph with the in-house flyback movement visible through the skeleton dial, making it one of the more visually dense pieces in the Big Bang catalog.

Technical Overview

• Case diameter: 45mm
• Case material: King Gold (18K red gold with platinum content)
• Reference: 411.OM.1180.RX
• Bezel: King Gold with six H-shaped screws
• Dial: skeleton, movement visible
• Crystal: sapphire
• Strap: black structured rubber with gold deployant
• Functions: flyback chronograph, hours, minutes, seconds, date

King Gold’s platinum addition prevents the surface from developing the greenish tint that standard rose gold can show after prolonged skin contact. The alloy maintains its warm hue consistently across years of wear.

Inside the Movement

The Unico flyback chronograph movement allows you to reset and restart the chronograph in a single pusher action rather than the traditional stop-reset-start sequence. Through the skeleton dial, you can trace the column wheel and coupling clutch that govern the chronograph train. The 45mm case provides enough dial real estate to display the chronograph sub-dials at nine and three without crowding the minute track. The 411.NX.1117.LR.0999 with jewel-set bezel uses the same Unico movement but frames it with a gemstone bezel for a different finishing approach. Both represent the full-size Big Bang Unico at its most mechanically transparent.

What Sets It Apart

Gold chronographs carry a specific kind of presence that steel and ceramic versions do not replicate regardless of design similarities. The 411.OM wears heavier than its titanium or ceramic counterparts, and that weight communicates immediately on the wrist. The King Gold surfaces catch and hold light in ways that the matte finishes on dark-material Big Bangs deliberately avoid. This replica big bang om puts the precious-metal statement front and center without diluting the Unico’s mechanical personality.