Hublot Big Bang Unico Sapphire

About this reference

The Hublot Big Bang Unico Sapphire (reference 411.JX.4820.RT) was introduced in 2016 as a limited edition of 500 pieces, marking a significant shift in the brand's use of industrial-scale sapphire casing. The 45mm case is constructed from polished sapphire crystal blocks, offering a 360-degree view of the in-house HUB1242 Unico movement. This caliber is a self-winding flyback chronograph with a column wheel visible on the dial side. The skeletonized dial features transparent resin components and luminescent hands to maintain the monochromatic aesthetic. Collectors value this reference as the foundational model for Hublot’s transparent series, representing a technical achievement in machining extremely hard materials. On the secondary market, this reference typically trades between $35,000 and $50,000 depending on condition. A notable production variant includes the "All Black" sapphire version, which utilized smoked crystal to achieve transparency while maintaining a dark profile.