Clean Factory Rolex GMT-Master II 126715CHNR 3285 Guide
The Clean Factory Rolex GMT-Master II 126715CHNR is a 40mm GMT configuration recognized by its black-and-brown 24-hour bezel, black dial and rose-gold-tone exterior.
One of the most important technical changes in this production generation is the transition from the earlier 3186-style GMT movement to a 3285-style automatic GMT movement, with the supplied specifications increasing the stated power reserve from approximately 42 hours to approximately 72 hours.
Other revisions focus on bezel operation, bracelet finishing and the crown emblem on the clasp.
Rather than evaluating the watch through broad terms such as “super clone watch,” this guide separates movement architecture, GMT functionality, power reserve, exterior finishing and individual QC performance.
40mm GMT Case
The 126715CHNR uses the familiar 40mm GMT case format.
For this configuration, the exterior is finished in a rose-gold color rather than being described as solid 18K rose gold.
The supplied information identifies a vacuum-plating process for the rose-gold-tone finish.
For technical accuracy, surface color and underlying material composition should always be treated separately.
Rose-Gold-Tone Vacuum Plating
The supplied specifications describe a vacuum-plating treatment used to create the rose-gold-tone exterior.
A plated finish should not be confused with solid precious-metal construction.
Useful QC areas include:
- Color consistency
- Case-to-bracelet color matching
- Link edges
- Clasp surfaces
- Crown
- Case-back edges
- Areas between bracelet links
Photographs taken under neutral lighting are preferable when documenting color because warm indoor lighting can significantly change the perceived tone.
Black and Brown 24-Hour Bezel
The 126715CHNR is distinguished by its two-tone black-and-brown 24-hour bezel, commonly referred to as the “Root Beer” or “沙士圈” configuration.
The bezel works together with the GMT hand to provide the 24-hour reference.
For QC, useful checks include:
- Bezel alignment
- 12 o’clock position
- Numeral filling
- Color transition
- Surface condition
- Rotation
- Click consistency
- Back play
Revised Bezel Feel
The supplied information indicates that bezel operation has been revised compared with previous production.
This is better evaluated mechanically than described using subjective terms such as “identical feel.”
A useful QC record can document:
Click Definition → Rotation Resistance → Back Play → Alignment
This allows different production generations to be compared more objectively.
3186 to 3285 Movement Generation
The largest technical update is the move from an earlier 3186-style movement to the newer 3285-style automatic GMT architecture.
Feature Earlier 3186 Version Current 3285 Version
Movement 3186-Style GMT 3285-Style GMT
Winding Automatic Automatic
GMT Functional Functional
Independent Local Hour Yes Yes
Stated Power Reserve Approx. 42h Approx. 72h
Movement Generation Earlier Updated
This is a meaningful movement-generation change rather than simply a cosmetic revision.
Approximately 72-Hour Power Reserve
The supplied specification lists approximately 72 hours of power reserve for the 3285 configuration, compared with approximately 42 hours for the previous 3186-style generation.
For a technical database, however, the 72-hour figure should initially be recorded as:
Factory/Supplied Specification: Approx. 72 Hours
Once an individual watch is tested, a second field can be added:
QC Measured Power Reserve: XX Hours
This distinction prevents a published specification from being mistaken for an individual measured result.
GMT Function
The 3285-style movement provides the functionality expected from this type of GMT architecture.
The local-hour hand can be adjusted independently while the additional GMT hand continues to provide a 24-hour reference.
This is particularly useful when changing time zones.
GMT testing should include:
- Local-hour adjustment
- GMT-hand operation
- Minute setting
- Date interaction
- Forward hour adjustment
- Reverse hour adjustment
- Midnight crossing
The GMT function should therefore be tested as a complete system rather than checking only whether the additional hand moves.
Time-Setting Direction
The supplied information also highlights a revised setting direction for the 3285 movement.
This can be documented during QC through a short crown-operation video rather than relying exclusively on the movement name.
Crown-position behavior is a useful identifying characteristic when comparing different GMT movement architectures.
Bracelet Finishing
The supplied information identifies additional finishing work on the bracelet.
For database purposes, this should be evaluated through observable characteristics rather than broad quality claims.
Useful areas include:
- Link brushing
- Polished surfaces
- Edge finishing
- Link articulation
- End-link fit
- Bracelet flexibility
- Clasp alignment
Macro photography can reveal differences that are difficult to identify in normal wrist photographs.
Clasp Crown Emblem
One of the smaller exterior revisions concerns the five-point crown emblem on the clasp.
The supplied information specifically highlights the finishing of the recessed/background areas around the crown structure.
This is a good example of a detail that should be photographed under macro magnification.
Useful comparison points include:
- Crown outline
- Five-point geometry
- Relief depth
- Background finishing
- Surface polishing
- Centering on the clasp
These details can be documented without claiming that the emblem is identical to another watch.
Why Version Identification Matters
A Clean Factory 126715CHNR equipped with an older 3186-style movement should not be placed in the same technical record as a newer 3285-equipped example.
A better database structure is:
126715CHNR → Clean Factory → Movement Generation → 3186 / 3285 → Individual QC Record
This allows changes in power reserve, GMT operation and physical construction to remain traceable over time.
What to Check During QC
For the Clean Factory 126715CHNR 3285 version, useful QC records include:
- Movement Version
- Daily Rate
- Amplitude
- Beat Error
- Beat Rate
- Measured Power Reserve
- GMT Operation
- Independent Local-Hour Adjustment
- Date Operation
- Crown Positions
- Time-Setting Direction
- Bezel Rotation
- Bezel Alignment
- Case Diameter
- Case Thickness
- Actual Weight
- Rose-Gold-Tone Finish
- Bracelet Articulation
- Clasp Operation
- Clasp Crown Detail
Power reserve is particularly worth measuring because 42h → 72h is one of the main claimed technical differences between the two movement generations.
Technical Specifications
Specification Details
Factory Clean Factory
Reference 126715CHNR
Collection GMT-Master II Style
Case Diameter Approx. 40mm
Dial Black
Bezel Black / Brown 24-Hour
Movement 3285-Style Automatic GMT
Previous Movement 3186-Style GMT
Stated Power Reserve Approx. 72 Hours
Previous Stated Reserve Approx. 42 Hours
GMT Functional
Local Hour Independently Adjustable
Exterior Finish Rose-Gold-Tone
Surface Treatment Vacuum Plating
Case Thickness Approx. 12.2mm*
QC Weight Approx. 150g*
*The 12.2mm thickness and approximately 150g weight come from your own previous QC measurement for a Clean Factory 126715CHNR-0001. They should be labeled as individual QC measurements, not universal specifications for every production example.
Frequently Asked Questions
- What movement does the current Clean Factory 126715CHNR use?
The supplied version uses a 3285-style automatic GMT movement, replacing the earlier 3186-style movement generation.
- What is the main difference between the 3186 and 3285 versions?
One of the main supplied differences is power reserve: approximately 42 hours for the earlier 3186-style configuration versus approximately 72 hours for the 3285-style version. The movement generation and setting architecture also differ.
- Does the 3285 provide an independently adjustable local-hour hand?
Yes. The supplied configuration supports independent local-hour adjustment for GMT use. This should still be function-tested during individual QC.
- Is the 126715CHNR case solid rose gold?
The supplied Clean Factory information describes a rose-gold-tone vacuum-plating treatment. It should therefore not be presented as solid 18K rose-gold construction without independent material verification.
- What should be checked on the black-and-brown bezel?
Important points include alignment, color transition, numeral filling, click consistency, rotational resistance and back play.
- How can the 72-hour power reserve be verified?
Fully wind the movement and record the elapsed running time until it stops. The result can then be published separately as QC Measured Power Reserve rather than treating the stated 72-hour specification as an individual test result.
