Hublot HUB44

Probable

Worth stating plainly because the designation invites the opposite reading: this is a 7750, and the correct expectation on inspection is a 7750 architecture carrying Hublot marks. Two consequences follow for an examiner — the sub-registers sit in the 7750's layout rather than an in-house one, and the unidirectional rotor's characteristic wobble is a property of the caliber and not a fault.

Specifications

Movement manufacturer: Hublot
Base caliber: Valjoux 7750
Frequency: 28,800 vph (4 Hz)
Power reserve: 42 hours
Winding: automatic
Complications: Chronograph · Cam switching · Date

Architecture

A Valjoux 7750 automatic chronograph finished and modified for Hublot: cam switching, oscillating-pinion clutch, three registers.

Service practice

Universally available service parts, since the base is the most widely produced automatic chronograph ever made. A rebuilt example containing generic components runs correctly and is an originality note rather than a finding.

Related calibers

Built on
Valjoux 7750
Succeeded by
HUB1280 Unico

References using this caliber

Hublot 301.SX.130.RXFactory
Big Bang · Whole production

Provenance of this record

Sources & Evidence

Primary sourceManufacturer documentation

Hublot — collection, material and caliber specifications

Hublot SA

Accessed: 2026-08-18

Cited for

This referenceHigh confidence

View source ↗

Secondary sourceCollector research

Hublot collector and market research on counterfeits and reference structure

Collector communities and specialist dealers

Accessed: 2026-08-18

Cited for

This referenceProbable

Last verified: Not yet reviewed