B Factory Rolex Sky-Dweller 336239-0003 – Cal.9002 Movement QC Review and Function Test

B Factory Rolex Sky-Dweller 336239-0003 – Cal.9002 Movement QC Review and Function Test

The B Factory Rolex Sky-Dweller 336239-0003 features a white-gold-style case, white dial, Oysterflex-style strap and sapphire crystal. The model has a nominal case size of 42mm.

This QC inspection focuses on the Cal.9002-designated movement, timekeeping performance, physical measurements and the practical operation of its calendar and 24-hour display.

Unlike a visual inspection alone, our testing included operating the watch’s adjustment mechanisms to confirm that the reported functions work.

A function adjustment video is also provided as a reference, allowing customers to understand the correct setting procedures before operating the watch.

Actual QC Test Results

QC Item Measured Result
Factory B Factory
Brand / Model Rolex Sky-Dweller
Reference 336239-0003
Case Style White Gold
Dial White
Strap Oysterflex-Style
Crystal Sapphire
Movement Cal.9002-designated
Daily Rate +0 s/day
Amplitude 276°
Beat Error 0.0ms
Beat Rate 28,800 BPH
Nominal Case Size 42mm
Measured Width 41mm
Measured Thickness 14mm
Measured Weight 186.1g
Function Test All reported functions operational

These measurements were obtained from the individual watch inspected. Results may vary slightly between samples depending on manufacturing tolerances, measurement positions and testing conditions.

Cal.9002 Movement and Timegrapher Performance

The tested watch uses a movement designated Cal.9002, operating at 28,800 beats per hour.

The timegrapher recorded a daily rate of 0 seconds per day, amplitude of 276° and beat error of 0.0ms.

The measured daily rate falls within our usual pre-shipment QC reference range of ±0–15 seconds per day.

A zero-second daily-rate reading is favorable under the test conditions, although it should not be interpreted as a guarantee of perfect accuracy during everyday wear.

Actual performance can change with power reserve, wearing position, temperature and usage patterns.

For this Sky-Dweller version, movement evaluation also includes verifying that its complication functions can be adjusted and operated correctly.

What We Found: Functional Month, Date and 24-Hour Display

One of the most important findings from this inspection is that the month, date and 24-hour display functions are operational.

The adjustment methods were confirmed during our QC inspection.

Bezel — Month Adjustment

The month indication is adjusted through the bezel-operated mechanism. This is a working adjustment function rather than a decorative feature.

Crown — Date Adjustment

The calendar date can be adjusted using the crown. This function was confirmed during testing.

Crown — 24-Hour Display Adjustment

The 24-hour indication can also be adjusted through the crown and provides a functional additional time display.

These findings are important because a complicated dial layout does not automatically mean that every indication is mechanically functional.

The tested sample demonstrates working adjustment mechanisms for the reported functions, providing a more meaningful basis for evaluating the movement than appearance alone.

Function Adjustment Video Reference

In addition to the physical QC inspection, we provide a function adjustment video to help customers understand how to operate this Sky-Dweller version.

The video demonstrates the relevant setting procedures, including:

* Month adjustment using the bezel.
* Date adjustment through the crown.
* 24-hour display adjustment through the crown.

Customers are encouraged to review the video before adjusting the watch, particularly if they are unfamiliar with the Sky-Dweller’s multi-function setting system.

Because this is a mechanically complicated movement, the correct adjustment sequence is important. Avoid forcing the bezel or crown if resistance is encountered, and do not assume that the setting procedure is identical across different factory versions.

The adjustment video serves as a practical operating reference alongside the QC findings.

Case Dimensions, Weight and Construction

The tested sample measured 41mm in width, 14mm in thickness and 186.1g in weight.

The measured width is slightly different from the nominal 42mm specification. This difference may reflect the measurement position or method rather than a manufacturing defect.

The recorded weight provides a useful reference for comparisons with other Sky-Dweller versions of similar configuration.

However, weight alone is not a reliable indicator of overall quality.

Case finishing, dial alignment, movement functionality, bracelet or strap construction and wearing comfort should also be considered.

The white-gold-style appearance describes the model’s design and should not be interpreted as independent verification of solid white-gold material.

B Factory Compared With Other Sky-Dweller Versions

Based on our experience comparing available factory versions, B Factory and competing manufacturers each have their own strengths.

Some versions may offer advantages in exterior finishing or dial details, while others may appeal to customers who prioritize movement functionality, weight or overall construction.

For this particular sample, the working month, date and 24-hour adjustments are meaningful technical features.

However, these results do not establish that B Factory is universally superior to every competing Sky-Dweller version.

The most suitable factory depends on the customer’s priorities and the specific details they value most.

A useful comparison should focus on documented features and actual inspection results rather than factory reputation alone.

Overall QC Assessment

The B Factory Rolex Sky-Dweller 336239-0003 produced favorable timegrapher results and passed the reported function tests.

Its most valuable QC finding is the practical operation of the Cal.9002-designated movement’s complications, particularly the bezel-controlled month setting and crown-controlled date and 24-hour indications.

The availability of a function adjustment video adds practical value by helping customers understand the correct operating procedures after receiving the watch.

Together, the movement readings, functional verification and physical measurements provide a useful technical reference for this particular B Factory configuration.

Long-term movement reliability cannot be determined from a single pre-shipment inspection, and careful operation remains important for complicated calendar watches.

FAQ

1. What movement does the B Factory Sky-Dweller 336239 use?

The tested sample uses a movement designated Cal.9002, operating at 28,800 BPH. The movement designation does not independently establish that its internal construction is identical to the original caliber.

2. Are the month, date and 24-hour functions operational?

Yes. All three reported functions were tested and confirmed to be operational. The month is adjusted through the bezel, while the date and 24-hour indications are adjusted through the crown.

3. Is a function adjustment video available?

Yes. We provide a function adjustment video demonstrating the setting procedures for the month, date and 24-hour display.

Customers can use it as a reference before making adjustments.

4. What are the actual dimensions and weight?

The tested sample measured 41mm in width, 14mm in thickness and 186.1g in weight.

5. Is B Factory better than other Sky-Dweller factories?

Not necessarily in every aspect. Different factories have their own strengths, and the most appropriate choice depends on whether the customer prioritizes exterior details, movement functions, construction or wearing characteristics.