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Movement tier: unclassified · caliber Hublot Cal. HUB1242 UNICO: in-house automatic flyback chronograph, 28,800bph, 72h PR, 330 parts; column-wheel, integrated case; used in Big Bang Unico ceramic series · 72h power reserve (3 days)
Large case: suits wrists 7 in+ (18 cm+)
44 mm case. A bold, statement-size wear. Best suited to larger wrists where the case sits flush.
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Ceramic case Big Bang; ceramic cannot be polished and is brittle at edges; inspect lug tips for chips under loupe.
Known issues in the market
Ceramic cannot be polished; a ceramic Big Bang with polished case surfaces has been incorrectly processed and the surface integrity is compromised.
Ceramic is brittle under lateral impact; lug tips and case edges are the first areas to chip.
Area
What to check
What is correct
Red flag
case
Ceramic surface condition
Original ceramic surface texture intact; no polish marks; ceramic is harder than steel
Polished ceramic surfaces; ceramic cannot be conventionally polished
case
Lug and edge chip inspection
Lug tips and case edges chip-free under loupe inspection
Chips on lug tips or case edges; ceramic brittleness under lateral impact
caseback
UNICO movement architecture
Cal. HUB1242 UNICO column-wheel flyback architecture visible through caseback
ETA 7750 or other movement; counterfeit or movement swap
Common legitimate replacements
Rubber strap; Hublot OEM.
Crystal; sapphire standard.
Expert resources: Hublot Big Bang Unico Ceramic product documentation; Hublot authorized service.
Authentication guide
Last reviewed June 2026
The ceramic Big Bang Unico is meaningfully lighter and colder to the touch than a steel watch of the same size. Ceramic is non-magnetic. Any magnetic response or steel-level weight is a disqualifying signal.
Known reproduction risks
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HIGH RISK
Steel or zinc-alloy case with black PVD coating sold as ceramic.
Magnetic response: ceramic is non-magnetic without exception
Weight: steel case will be 25 to 40g heavier than genuine ceramic
Surface scratch pattern: steel PVD shows linear micro-scratches; ceramic chips at edges rather than scratching
Warmth: PVD-coated steel warms to body temperature; ceramic remains cooler longer
A magnet and a scale resolve this question in under 30 seconds.
MEDIUM
Correct ceramic case with non-original UNICO movement.
Caseback shows movement without column wheel or incorrect rotor architecture
Flyback function absent
Dial variants by era
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Era
Description
Identifiers
2011 to present
Same skeleton dial architecture as the titanium/steel Unico; ceramic case and bezel finish is matte-satin with a finer grain than bead-blasted steel.
Caseback ring engraved "441.CI" on standard black ceramic model (CI = ceramic)
Bezel surface texture is uniform matte-satin with no visible machining lines at the screw wells
Case edges have a slight natural chipping risk at sharp corners; genuine ceramic may show micro-chips at corners that are characteristic of the material, not damage
Service part flags
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Case material
Original: Microblasted black ceramic (zirconium oxide); lighter than steel; non-magnetic; cold to the touch; scratch-resistant but chip-prone at thin edges.
Replacement tells
Case responds to a magnet (steel base)
Case weight matches or exceeds a comparable steel Big Bang
Case surface shows micro-scratches consistent with steel rather than the chip pattern of ceramic
Case feels warm to the touch like metal rather than cold like ceramic
Bezel screws
Original: Six H-shaped black ceramic or PVD-coated screws seated in ceramic bezel; screw material matches the bezel.
Replacement tells
Polished steel screws in a matte ceramic bezel
Screw color does not match the bezel color
Case back markings
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2011 to present
Sapphire caseback showing HUB1242 UNICO caliber identical to titanium/steel versions
Inner case ring engraved with "CI" designation indicating ceramic case material
Reference "441.CI.1171.RX" on standard all-ceramic model
Movement tells
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The UNICO HUB1242 is identical across ceramic and non-ceramic Big Bang versions; movement authentication follows the same procedure.
The ceramic case is approximately 15 to 20 percent lighter than a steel case of the same geometry; with rubber strap the full watch should weigh roughly 155 to 165g.
