The HUB9005 Inspired is a quartz calibre with a single-axis tourbillon inspired rotating cage, used in replica Hublot Big Bang references where an open-dial tourbillon window with single-plane rotation is required as a visual element. The movement is battery-powered and requires no winding — timekeeping is regulated by a quartz oscillator. The rotating cage operates independently from the quartz timekeeping circuit and revolves on a single plane, producing the visual motion associated with a tourbillon complication without performing the gravity-compensation function of a genuine tourbillon. Its function is visual animation only.
In replica watches, the HUB9005 is the standard quartz tourbillon inspired specification for Big Bang references where single-axis cage rotation satisfies the visual requirement of the reference being replicated. It sits below the HUB9009 in the tourbillon inspired hierarchy — both are quartz calibres with no winding requirement, but the HUB9009 delivers an additional rotational axis for references where bi-axis rotation is a defined visual requirement. Where single-axis rotation is sufficient, the HUB9005 remains the standard specification. The HUB6311 occupies a separate position in the range as a manual wind calibre with single-axis rotation.
In Practice
- The HUB9005 is battery-powered quartz — no winding or wrist motion is required to maintain power. Timekeeping is regulated by a quartz oscillator. Battery replacement is the only maintenance requirement for continued operation.
- Single-axis rotation means the cage revolves on one plane only — typically visible as a continuous rotation through the dial aperture. This produces the visual impression of a tourbillon complication without the mechanical complexity or gravity-compensation function of a genuine calibre.
- The rotating cage is driven by an independent motor circuit and is not connected to the escapement or timekeeping regulation. Cage rotation and timekeeping accuracy are entirely separate functions — the cage contributes nothing to positional rate correction.
- The HUB9005 is specified for references where single-axis cage rotation satisfies the visual requirement — it is not a reduced-specification alternative to the HUB9009 for all references, but the correct calibre for references where bi-axis rotation is not a defined requirement.
- Within the tourbillon inspired calibre range: the HUB6311 is manual wind with single-axis rotation; the HUB9005 is quartz with single-axis rotation; the HUB9009 is quartz with bi-axis rotation. Reference specification determines which calibre is appropriate — axis count and winding type are the two differentiating variables.
Related Terms
Tourbillon Inspired · HUB6311 Tourbillon Inspired · HUB9009 Inspired · Quartz Movement · Skeleton Watch · Exhibition Caseback
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For a full overview of movements used in replica watches — including how tourbillon inspired calibres compare to other movement types — see our Replica Watch Movements Explained →