Tudor · MT54 series
MT5402
A compact Tudor manufacture automatic for three-hand watches such as the Ranger and original Black Bay Fifty-Eight.
At a glance
- Type
- Automatic mechanical
- Display / complication
- Time only
- Architecture
- Variable-inertia balance, silicon hairspring, bidirectional rotor
- Timebase
- 28,800 vph / 4 Hz
- Power reserve
- Approx. 70 h
- Movement height
- 4.99 mm
- Jewels
- 27
Reference sources reviewed 7 November 2026. Published specifications, not independent measurements. Versions and complete-watch specifications can differ; fields without a verified figure are omitted or identified.
Find it in a watch
Tudor Black Bay Fifty-Eight 79030N; Ranger 79950
An example from the linked references. Check the exact model and production generation.
What distinguishes it
Look beyond the reference.
Its balance is supported by a bridge secured at two points, and the silicon spring is non-magnetic. The 26 mm movement diameter and 4.99 mm thickness in Tudor’s launch specification show why it was useful for the smaller Black Bay Fifty-Eight.
For the enthusiast
Read the full reference when comparing newer Tudor generations. MT5402 and calibres carrying a different number or a -U suffix should not be treated as one universal specification. The approximately 70-hour reserve assumes a full wind; normal wear may replenish less energy.