UFO Factory Rolex Daytona 126500 4131 Free-Sprung Guide
The UFO Factory Rolex Daytona 126500 is a 40mm automatic chronograph currently presented in both black-dial and white-dial configurations.
A key technical feature of this version is its 4131-style free-sprung movement, combined with a case and bracelet described as using 904L stainless steel.
Rather than treating this simply as a new production version, the most useful way to document the 126500 is through its movement architecture, case material, dimensions, dial configuration and individual QC results.
The market term “super clone watch” does not define these technical characteristics and should not be used as a substitute for the actual specifications.
40mm Case
The supplied specification lists the case at approximately 40mm.
This measurement should be recorded separately from case thickness and total weight because all three measurements contribute to the actual proportions and wearing characteristics of the watch.
At present, no case-thickness or weight measurement was included in the supplied information, so these values should be added only after physical measurement.
Black and White Dial Versions
The current UFO Factory 126500 information identifies two primary dial configurations:
- Black Dial
- White Dial
These should be recorded separately in the model database even when the underlying movement and case specifications are shared.
Useful dial QC points include subdial alignment, printing, hour markers, hands and chronograph reset position.
4131-Style Movement
The primary technical feature of this version is its 4131-style automatic mechanical chronograph movement.
The 4131 designation is particularly important when distinguishing this 126500 generation from earlier Daytona-style configurations using 4130-type movements.
For database purposes, movement generation should therefore be recorded alongside the model reference rather than describing the watch only as a 126500.
Free-Sprung Balance Architecture
The supplied information identifies the current 4131 configuration as using a free-sprung balance architecture.
A free-sprung movement does not use a conventional regulator arm to alter the effective working length of the hairspring.
Instead, regulation is performed through the balance assembly.
This is a structural characteristic of the movement and should not automatically be interpreted as a guarantee of greater accuracy.
Actual performance still depends on assembly, regulation and the condition of the individual movement.
Chronograph Function
As a Daytona-style movement, the 4131 configuration incorporates mechanical chronograph functionality.
During QC, the chronograph should be tested through a complete operating cycle:
- Start
- Stop
- Reset
- Central Chronograph Seconds
- Subdial Operation
- Reset-to-Zero Alignment
Testing the complete sequence is particularly important because normal timekeeping alone does not verify chronograph operation.
Movement Architecture
The supplied description indicates that this production generation includes revisions to the internal movement construction.
However, the original statement concerning previous “incorrect” or non-functional components does not identify the exact parts clearly enough to document them accurately.
For that reason, a technical database should avoid assigning specific component names until the movement can be inspected or more detailed technical information becomes available.
This prevents an unverified factory claim from becoming a database fact.
904L Stainless-Steel Construction
The supplied specification identifies 904L stainless steel for the steel construction.
904L stainless steel is known for corrosion resistance and its ability to accept polished and brushed surface finishing.
However, material designation alone does not determine overall case quality.
Useful exterior inspection points include:
- Brushing
- Polishing
- Edge definition
- Case geometry
- Bracelet finishing
- Clasp operation
Why the Exact Version Matters
For technical identification, this watch can currently be classified as:
UFO Factory → Daytona 126500 → 40mm → Black/White Dial → 4131 → Free-Sprung
This is more useful than simply describing it as a “new UFO Daytona.”
If later production batches introduce changes to the movement, case, weight or dial, those changes can then be recorded as separate version updates without creating duplicate articles.
What to Check During QC
When an individual UFO Factory 126500 is available, useful QC records include:
- Daily Rate
- Amplitude
- Beat Error
- Beat Rate
- 4131 Movement
- Free-Sprung Balance
- Chronograph Start
- Chronograph Stop
- Chronograph Reset
- Reset-to-Zero Alignment
- Case Width
- Case Thickness
- Actual Weight
- Dial Alignment
- Bracelet and Clasp
This creates measurable data that can later be compared across different production batches.
Technical Specifications
Specification Details
Factory UFO Factory
Model Rolex Daytona 126500 Style
Case Size 40mm
Dial Options Black / White
Movement 4131-Style Automatic Chronograph
Balance Architecture Free-Sprung
Case Material 904L Stainless Steel
Chronograph Mechanical
Case Thickness Not Yet Provided
Weight Not Yet Provided
Frequently Asked Questions
- What movement does the UFO Factory 126500 use?
The supplied specification identifies a 4131-style automatic chronograph movement with a free-sprung balance architecture.
- What size is the UFO Factory Daytona 126500?
The supplied case diameter is approximately 40mm.
- Which dial colors are available?
The supplied information identifies black-dial and white-dial versions.
- What does free-sprung mean?
A free-sprung balance does not rely on a conventional regulator arm to adjust the effective hairspring length. Regulation is instead performed through the balance assembly.
- Does free-sprung automatically mean better accuracy?
No. It describes the regulation architecture. Actual accuracy depends on movement condition, assembly and regulation and should be verified using QC measurements.
- How should this UFO 126500 version be identified?
The most useful database identification is UFO Factory 126500 / 40mm / 4131-style free-sprung movement / black or white dial, followed by the individual watch’s QC measurements.
