Product Information
* Factory: EWE Factory
* Brand: Rolex
* Collection: Cosmograph Daytona
* Reference: 116500LN-0002
* Case Size: 40 mm
* Dial: Black Dial
* Movement: 4130 Automatic Chronograph Movement
* Crystal: Sapphire Crystal
Technical Specifications
* Measured Case Diameter: 40.2 mm
* Measured Case Thickness: 12.4 mm
* Measured Weight: 140.1 g*
* Movement: 4130 Automatic Chronograph Movement
* Beat Rate: 28,800 BPH
* Crystal: Sapphire Crystal
*The 140.1 g figure is the actual measured weight of the individual watch inspected. Bracelet sizing, production tolerances and individual assembly may result in minor differences between watches.
Timegrapher Test Results
* Daily Rate: +4 Seconds/Day
* Amplitude: 315°
* 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 readings can vary according to power reserve, watch position, ambient temperature and testing conditions. The recorded +4 seconds/day represents the performance observed at the time of inspection rather than a permanently fixed daily rate.
For QC evaluation, the daily rate should be considered together with amplitude, beat error and actual functional testing.
4130 Automatic Chronograph Movement
This EWE Factory Rolex Daytona 116500LN-0002 is equipped with a 4130 automatic chronograph movement operating at 28,800 vibrations per hour.
The recorded results were:
* Daily Rate: +4 Seconds/Day
* Amplitude: 315°
* Beat Error: 0.0 ms
* Beat Rate: 28,800 BPH
The movement showed stable readings under the recorded testing conditions.
For a chronograph watch, timegrapher data alone is not sufficient for the final QC assessment. The chronograph mechanism should also be operated through a complete start, stop and reset cycle before shipment.
Chronograph Function Inspection
The chronograph is one of the key mechanical functions of the Daytona.
Pre-shipment inspection should include:
* Chronograph start
* Chronograph stop
* Chronograph reset
* Central chronograph seconds hand
* Subdial operation
* Reset-to-zero alignment
* Pusher operation
* Crown operation
* Manual winding
* Automatic winding
* Time setting
After resetting the chronograph, the central chronograph seconds hand and relevant counters should return correctly to their starting positions.
Repeated operation should also be checked to identify abnormal sticking or inconsistent pusher response.
40.2mm Case, 12.4mm Thickness and 140.1g Weight
The individual watch inspected measured:
* Case Diameter: 40.2 mm
* Case Thickness: 12.4 mm
* Measured Weight: 140.1 g
These measurements provide useful physical reference data for this individual EWE Factory 116500LN-0002.
The 12.4 mm measured thickness is particularly relevant on a chronograph because the movement and chronograph mechanism can influence overall case proportions.
The 140.1 g measured weight applies specifically to this QC sample and should not be treated as a guaranteed weight for every production piece.
Black Dial Inspection
The black dial is one of the defining visual elements of reference 116500LN-0002.
Because the dial contains multiple subdials, applied markers, hands and printed scales, alignment deserves detailed inspection.
QC should focus on:
* Dial surface condition
* Printing consistency
* Hour-marker alignment
* Main hand alignment
* Chronograph seconds-hand alignment
* Subdial hand positioning
* Subdial printing
* Dial cleanliness
The chronograph seconds hand should also be checked after reset to confirm its resting alignment.
Sapphire Crystal Inspection
The watch uses a sapphire crystal.
Pre-shipment inspection should cover:
* Crystal clarity
* Surface condition
* Correct installation
* Edge condition
* Visible scratches or damage
* Clear dial visibility
The crystal should be inspected from several viewing angles because reflections can make small surface or installation issues easier to identify.
Bezel, Case and Bracelet Inspection
For the 116500LN, the relationship between the bezel, case, dial and bracelet contributes significantly to the overall visual balance.
Important QC areas include:
* Bezel alignment
* Bezel scale condition
* Case brushing and polishing
* Surface transitions
* Crown and chronograph pushers
* Bracelet-link finishing
* Link articulation
* Bracelet-to-case integration
* Clasp operation and locking
The pushers should operate consistently without abnormal resistance, while the bracelet and clasp should move and lock correctly.
QC Observations
This EWE Factory Rolex Daytona 116500LN-0002 recorded:
* +4 seconds/day
* 315° amplitude
* 0.0 ms beat error
* 28,800 BPH
* 40.2 mm measured diameter
* 12.4 mm measured thickness
* 140.1 g measured weight
The 4130 automatic chronograph movement produced stable timegrapher readings under the recorded testing conditions.
For this Daytona configuration, movement performance should be evaluated together with the chronograph operation. Particular attention should be given to start, stop and reset functions, chronograph-hand alignment, subdial operation and pusher response.
The 40.2 mm diameter, 12.4 mm thickness and 140.1 g weight provide actual dimensional reference data for the inspected watch.
Final evaluation should remain based on the individual QC sample, particularly for movement readings, chronograph operation, dial alignment and exterior assembly.
Pre-Shipment QC Inspection
* ✔️ 4130 automatic chronograph movement checked
* ✔️ Timegrapher readings recorded
* ✔️ +4 seconds/day rate documented
* ✔️ 315° amplitude recorded
* ✔️ 0.0 ms beat error recorded
* ✔️ 28,800 BPH beat rate confirmed
* ✔️ Automatic winding function checked
* ✔️ Manual winding function checked
* ✔️ Crown operation checked
* ✔️ Time-setting function checked
* ✔️ Chronograph start function checked
* ✔️ Chronograph stop function checked
* ✔️ Chronograph reset function checked
* ✔️ Chronograph seconds-hand alignment checked
* ✔️ Subdial operation inspected
* ✔️ Chronograph pushers checked
* ✔️ Case diameter measured at 40.2 mm
* ✔️ Case thickness measured at 12.4 mm
* ✔️ Individual watch weight measured at 140.1 g
* ✔️ Sapphire crystal inspected
* ✔️ Black dial surface checked
* ✔️ Hour-marker and hand alignment inspected
* ✔️ Bezel alignment checked
* ✔️ Case finishing inspected
* ✔️ Bracelet articulation checked
* ✔️ Bracelet-to-case integration inspected
* ✔️ Clasp locking function checked
* ✔️ Overall exterior assembly inspected
* ✔️ Final pre-shipment QC inspection completed
