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B Factory Reviews 2026-07-21

How Stable Is B Factory Daytona with 4131 Movement?

Since the new 4131 Daytona launched, stability is the top concern. One month of testing shows +2s/day and a 72h power reserve, matching genuine specs.

  • Ref: m126500ln-0002
  • Movement: 4131
  • Power reserve: 72h
  • Shock: Paraflex

The column wheel chronograph feels crisp and resets cleanly, with a genuine-like architecture.

B Factory Daytona movement

The 4131 version is currently the ceiling of replica Daytonas.

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