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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 44 · 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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Authentication

Big Bangs are among the most counterfeited luxury sport watches; the in-house UNICO column-wheel flyback architecture through the caseback is the definitive check.

Known issues in the market
  • Counterfeit Big Bangs are extremely common; fakes universally use ETA 7750 or clones instead of the HUB1242 UNICO.
  • Any Big Bang Unico caseback showing a cam-actuated movement or ETA 7750 architecture is counterfeit or has a movement swap.
AreaWhat to checkWhat is correctRed flag
casebackUNICO movement architectureCal. HUB1242 UNICO with column-wheel flyback architecture visible through casebackETA 7750 or cam-actuated movement; definitive counterfeit or swap indicator
caseScrew orientationAll visible case screws at the same rotation angle (torqued to a specific position)Randomly oriented screws; indicates disassembly, counterfeit, or non-factory reassembly
dialDial printing qualityCrisp multi-layer dial printing; correct font weight on all subdialsBlurry or offset printing; wrong font weight; counterfeit dial
Common legitimate replacements
  • Rubber strap; Hublot OEM recommended.
  • Crown; Big Bang crowns subject to wear.
Expert resources: Hublot authentication documentation; Hublot Geneve forums; authorized Hublot service centers.

Authentication guide

Last reviewed June 2026

The Big Bang Unico is one of the most replicated Swiss watches on the market. The in-house UNICO flyback chronograph and the six H-shaped bezel screws are the two fastest authentication anchors.

Known reproduction risks

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HIGH RISK

Steel-cased reproductions sold as titanium Big Bang Unico.

  • Steel case is heavier; genuine titanium Big Bang Unico should weigh approximately 175g with rubber strap
  • Steel responds to a magnet; titanium does not
  • Case finish on steel reproductions shows machine marks at lug junctions; genuine titanium is hand-brushed

Weight alone is a reliable quick test. A titanium Big Bang with rubber strap reads noticeably lighter than a steel watch of the same dimensions.

HIGH RISK

Non-original movement behind the sapphire caseback, relabeled to appear as UNICO.

  • Column wheel absent or decorative (non-functional)
  • Rotor not skeletonized or lacks "UNICO" engraving
  • Bridges lack the angular architecture of the HUB1242
MEDIUM

Bezel screw substitution: correct count, incorrect profile.

  • H-slot edges are rounded rather than sharp
  • Screw finish inconsistent with case material (bright screws on black PVD case, etc.)

Dial variants by era

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EraDescriptionIdentifiers
2010 to 2014 (first generation)Skeleton dial with open architecture showing the UNICO column wheel directly; subdials at 3 and 9; rubber-textured lower dial section.
  • HUB1242 caliber designation on movement bridge
  • Subdial rings finished in matte grey or matte black
  • Rubber insert in lower case between lugs, matching strap color
2014 to present (current generation)Refined dial layout with cleaner column-wheel aperture; improved anti-reflective coating on sapphire crystal.
  • Column wheel aperture at 9 o'clock, clearly visible without loupe
  • Flyback pusher at 4 o'clock (integrated into case, not a separate tube)
  • Power-reserve subdial at 3 o'clock graduated 0 to 72h

Service part flags

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Bezel screws

Original: Six H-shaped black PVD or polished screws with sharp-edged H-slot; torqued to spec and seated flush.

Replacement tells
  • Rounded or poorly defined H-slot profile
  • Screws not flush with bezel surface; visible gap or proud seating
  • Inconsistent finish across the six screws
Rubber strap attachment

Original: Hublot One Click system: strap detaches and reattaches with finger pressure, no tools; the lug incorporates a small release tab.

Replacement tells
  • Standard spring-bar slot visible at the lug instead of the One Click tab
  • Strap requires a spring-bar tool to swap
  • Replacement strap uses a conventional buckle not stamped "HUBLOT"
Crown

Original: Oversized rubber-coated crown with "H" relief; screws down; rubber is factory-bonded, not a pressed-on sleeve.

Replacement tells
  • Rubber sleeve on crown slides or rotates independently
  • "H" relief absent or shallow
  • Crown does not screw down with positive stop

Case back markings

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2010 to present
  • Transparent sapphire caseback showing skeletonized UNICO rotor and column wheel
  • Rotor engraved "HUBLOT" and "UNICO"
  • Reference number and serial engraved on inner case ring
  • Water resistance designation: "100M / 330FT"

Movement tells

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  • The UNICO column wheel is visible through the dial aperture at 9 o'clock; it should rotate smoothly when a pusher is pressed with the chronograph running.
  • The flyback function resets and restarts the chronograph in a single gesture at the 4 o'clock pusher; non-genuine movements commonly lack true flyback and require stop-reset-start.
  • Through the caseback, the skeletonized rotor oscillates visibly; look for the column wheel arms, which are machined from a single piece and have polished bevels.
  • After a full service, the movement should deliver the stated 72-hour power reserve from full wind; less than 60 hours suggests worn mainspring or incomplete service.
Sources: Hublot official authentication service; Hodinkee Big Bang Unico in-depth.

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