The Big Bang Meca-10 King Gold is a skeletonised, hand-wound Big Bang built around a 10-day power reserve and an openly displayed power reserve mechanism. Rather than hiding the movement behind a dial, the watch turns the mechanism itself into the face, with an architecture inspired by Meccano-style construction sets: a ring-shaped base plate carrying bridges in place of a conventional mainplate.
The Meca-10 line was first shown at Baselworld 2016 in titanium and black ceramic, introducing the in-house HUB1201 calibre that took about two years to develop. This King Gold version, reference 414.OI.1123.RX, was added to the line at Baselworld 2017, alongside a Magic Gold execution of the same watch.
Within the Big Bang collection it sits as a precious-metal, technically focused piece. It is a regular-production model rather than a limited edition, and pairs Hublot’s proprietary 18K King Gold with the brand’s signature rubber strap.
The watch has no conventional dial. The face is the openworked HUB1201 movement, presented as a matte black skeleton with blackened bridges, so the twin barrels, gear train, balance and power reserve mechanism are all visible from the front.
Hour markers are applied 18K King Gold appliqués with white luminous fill, in a mix of Arabic numerals and batons. Ten markers surround the opening; the positions at 8 and 9 o’clock are left open for the balance and the small seconds. The hands are King Gold batons with luminous fill.
The power reserve is shown in more than one place. A printed disc numbered from 0 to 10 sits toward 6 o’clock with a red window framing the current day, a hollowed wheel near 3 o’clock reveals a red area during the last two days of reserve, and two sliding racks move across the top of the movement on a 9 to 3 o’clock axis, giving a rough visual sense of how wound the watch is. Small seconds run at 9 o’clock.
A raised black inner flange rings the movement, carrying a printed minute track with five-minute Arabic increments, along with the “HUBLOT” and “SWISS MADE” text.
The case is the round Big Bang sandwich design in 18K King Gold, 45 mm in diameter, with a microblasted (satin) finish set against polished accents. Black composite resin inserts run along the lateral flanks of the case centre, and the case sides carry the exposed screw fixings typical of the Big Bang.
Case thickness is measured at roughly 15.7 mm. A sapphire crystal with anti-reflective treatment sits over the movement, and the caseback is a sapphire exhibition back that shows the reverse of the HUB1201. Water resistance is 100 m. The crown is 18K King Gold fitted with a black rubber grip.
The bezel is 18K King Gold, secured by six H-shaped, black-plated titanium screws. It is fixed and decorative, with no timing or measuring function, so the case and bezel work purely as the mount and frame for the skeletonised movement.
The reference is fitted with a black structured, lined rubber strap. It attaches to the case through Hublot’s One Click system, which allows the strap to be released and swapped without tools.
The strap is closed by a deployant (folding) buckle clasp made from 18K King Gold and black-plated titanium, matching the metal treatment of the case and bezel.
The movement is the HUB1201 manufacture Meca-10 calibre, a manual-winding, fully skeletonised movement. It is built from 223 components with 24 jewels, runs at 21,600 vibrations per hour (3 Hz), and uses two parallel mainspring barrels to deliver a 240-hour, 10-day power reserve.
Its functions are hours, minutes, small seconds and power reserve indication. The construction replaces the usual full mainplate with a ring-shaped base and fixed bridges, the feature that gives the movement its construction-set appearance from both sides.
The signature element is the power reserve system. Power transfers through a ten-tooth pinion at the centre of a double rack; as the mainsprings unwind, the rack slides across the movement and drives a day-count display running from 0 to 10, while a separate wheel reveals a red warning as the reserve enters its final two days.
Operation is straightforward: the watch is wound by hand through the crown, reaching a full charge of about ten days, and the time is set from the same crown.
Case, bezel and crown are 18K King Gold, Hublot’s proprietary red gold alloy. It is an 18-carat (75% gold) blend with a raised copper content for a deeper red tone and a small platinum addition to stabilise the colour and resist oxidation over time.
The bezel screws are black-plated titanium. The crystal is sapphire with anti-reflective treatment, and the caseback is sapphire. The movement bridges are blackened. Black composite resin forms the lateral case inserts, and the strap is structured rubber closed by a King Gold and black-plated titanium clasp.
The overall material character pairs a warm precious metal against dark technical finishes: King Gold framed by black titanium, black resin, blackened bridges and black rubber.
A full set for this reference includes:
Older version
Newer version
The reference used a single box style across its production life. Because there is one correct box era, a generic or replacement box on an otherwise complete example weakens a full-set listing.
The watch was supplied with a standard Hublot plastic warranty card, issued and completed by the dealer at point of sale, alongside a paper booklet and service papers. Original coverage was Hublot’s two-year warranty, with extensions applied where applicable.
Older version
Newer version
The reference carried a single main warranty style: a dealer-issued plastic card with paper booklet and service papers, on Hublot’s two-year original warranty with extensions where applicable. A completed, dealer-stamped card remains the key documentation for a full-set example; blank or photocopied cards are a warning sign.
The reference remains a catalogued model in the Big Bang Meca-10 range. Hublot introduced a smaller 42 mm Meca-10 in 2025 as an addition to the line rather than a replacement for the 45 mm models.
At 45 mm across and roughly 15.7 mm thick, with a lug-to-lug close to 57 mm, this is a large watch with strong wrist presence. The King Gold case gives it real weight, more than the titanium or ceramic versions of the same reference.
The rubber strap and One Click mounting keep it manageable despite the size, and the strap flexes to the wrist rather than sitting rigid. It suits medium to larger wrists and reads as a statement piece rather than a discreet everyday watch.
This reference exists in a single configuration: a 45 mm 18K King Gold case and bezel, a matte black skeletonised HUB1201 movement serving as the face, applied King Gold luminous markers and hands, and a black structured rubber strap with an 18K King Gold and black-plated titanium deployant clasp.
Neighboring references (separate references, specifications do not carry across):
Personalized, end-to-end service to help you buy, sell, and trade with ease
