Product Information
* Factory: Clean Factory
* Brand: Rolex
* Collection: GMT-Master II
* Reference: 126710GRNR
* Movement: 3285 Automatic GMT Movement
* Crystal: Sapphire Crystal
Technical Specifications
* Case Diameter: 40.0 mm
* Case Thickness: 12.2 mm
* Measured Weight: 143 g*
* Movement: 3285 Automatic GMT Movement
* Beat Rate: 28,800 BPH
* Crystal: Sapphire Crystal
*The measured weight of 143 g applies to the individual watch inspected in this QC report. Minor differences may occur between individual watches due to bracelet sizing, production tolerances and batch configuration.
Timegrapher Test Results
* Daily Rate: +6 Seconds/Day
* Amplitude: 306°
* Beat Error: 0.0 ms
* Beat Rate: 28,800 BPH
Testing Note
These readings were recorded from this individual watch during its pre-shipment QC inspection.
Mechanical movement performance can vary depending on mainspring power, watch position, ambient temperature and testing conditions. The recorded values represent the movement’s condition at the time of inspection and should not be interpreted as permanently fixed daily performance.
3285 Movement Performance
This Clean Factory Rolex GMT-Master II 126710GRNR is equipped with a 3285 automatic GMT movement, operating at 28,800 vibrations per hour.
During this QC inspection, the movement recorded a +6 seconds/day rate, 306° amplitude and 0.0 ms beat error.
The recorded movement data showed stable operation under the testing conditions. For a GMT model, the inspection should also include actual operation of the movement functions rather than relying only on timegrapher readings.
Automatic winding, manual winding, time setting, independent local hour-hand adjustment, GMT hand operation and date switching should all be checked individually before shipment.
GMT Function Inspection
The independent local hour hand is an important functional point when inspecting a GMT-Master II 126710GRNR.
During pre-shipment QC, attention should be given to:
* Independent local hour-hand adjustment
* GMT hand operation
* Date change when the local hour hand crosses midnight
* Correct crown positions
* Hour, minute and GMT hand alignment
* Smooth operation without unusual resistance
This functional inspection provides additional information beyond the movement’s timegrapher readings.
Case, Crystal and Exterior Details
The inspected watch measured 40.0 mm in diameter and 12.2 mm in thickness, with an individual measured weight of 143 g.
The sapphire crystal should be inspected for clarity, surface condition and correct installation. The dial, hands, hour markers, date window and GMT hand alignment should also be examined under close inspection.
The bezel is another important QC area on this model. Rotation, insert alignment and overall fit should be checked before shipment.
QC Observations
The overall detail finishing of this Clean Factory GMT-Master II 126710GRNR was one of the stronger aspects observed during inspection.
The case proportions, dial presentation, hand alignment, bezel assembly, bracelet construction and exterior finishing showed a good level of consistency on the inspected watch.
The 3285 movement also produced strong recorded results, including +6 seconds/day, 306° amplitude and 0.0 ms beat error.
Based on the exterior finishing and movement performance observed during this inspection, this Clean Factory 126710GRNR can be considered one of the better-finished versions currently available for this model.
However, factory reputation alone should not replace individual QC. Production batches and individual watches can vary, so the actual movement performance, GMT functions, dimensions, bracelet, bezel and assembly should still be inspected before shipment.
Pre-Shipment QC Inspection
* ✔️ 3285 automatic GMT movement checked
* ✔️ Timegrapher readings recorded
* ✔️ Automatic winding function checked
* ✔️ Manual winding function checked
* ✔️ Time-setting function checked
* ✔️ Independent local hour-hand adjustment checked
* ✔️ GMT hand operation tested
* ✔️ Date-change operation checked
* ✔️ Crown positions inspected
* ✔️ Case diameter measured at 40.0 mm
* ✔️ Case thickness measured at 12.2 mm
* ✔️ Individual watch weight measured at 143 g
* ✔️ Sapphire crystal inspected
* ✔️ Dial and hour-marker alignment checked
* ✔️ Hour, minute and GMT hand alignment checked
* ✔️ Bezel rotation and insert alignment inspected
* ✔️ Bracelet and clasp operation checked
* ✔️ Exterior finishing and overall assembly inspected
* ✔️ Final pre-shipment QC inspection completed
