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.

The 4131 version is currently the ceiling of replica Daytonas.