This replica big bang 45mm uses the 301.SX.130.RX reference as its blueprint, placing Hublot’s signature fusion of rubber and metal into a polished steel package. The 45mm case diameter sits firmly in oversized territory, but the integrated rubber strap and relatively compact lug-to-lug distance keep it wearable on most wrists. Stainless steel forms both the case and the six signature H-shaped screws on the bezel, giving this version a clean monochromatic look that stays versatile across settings. Compared to the king gold 301.PX, this all-steel variant reads sportier and lighter on the wrist.

Case & Movement Specs

• Case diameter: 45mm
• Case material: polished and satin-finished stainless steel
• Bezel: stainless steel with 6 H-shaped titanium screws
• Crystal: sapphire with anti-reflective coating
• Dial: matte black with luminous markers
• Strap: black rubber with deployment buckle
• Movement: automatic chronograph
• Functions: hours, minutes, seconds, chronograph, date

The 301.SX uses the same case architecture found across the original Big Bang lineup, with a sandwich construction that layers steel, composite, and rubber gaskets. The crown at 3 o’clock features the Hublot logo engraving and a rubber grip for easy operation.

Caliber Breakdown

Inside sits an automatic chronograph movement with a column wheel mechanism. The subdials at 3, 6, and 9 carry running seconds, 30-minute counter, and 12-hour totalizer respectively. Power reserve reaches roughly 42 hours from a full wind. The sapphire caseback reveals the decorated rotor and bridges. For anyone comparing the big bang 301.sx.130.rx against other chronograph options in the range, this steel version offers the lowest visual contrast, making it the most understated entry in the Big Bang lineup. You might also consider the king gold 301.PX.130.RX if a warmer tone suits your rotation better.

How It Compares

Within the Big Bang chronograph family, the 301.SX sits as the accessible steel anchor. No precious metal, no diamonds, no ceramic accents. That restraint gives it a tool-watch directness that the gold and bejeweled variants sacrifice for visual impact. On the wrist, 45mm wears large but balanced thanks to the tapered rubber strap pulling the case close to skin. This replica big bang 45mm delivers the core Hublot design language without any of the added complexity.