Product Information
* Factory: SN Factory
* Brand: Rolex
* Collection: Cosmograph Daytona
* Reference: 6263
* Style: Vintage
* Movement: Modified 7750 Manual-Winding Chronograph Movement
* Bracelet Construction: Hollow-Link Style
Technical Specifications
* Measured Case Diameter: 38.0 mm
* Measured Case Thickness: 16.0 mm
* Measured Weight: 98.4 g*
* Movement: Modified 7750 Manual-Winding Chronograph Movement
* Winding Type: Manual Winding
* Beat Rate: 21,600 BPH
* Bracelet: Hollow-Link Style
*The measured weight of 98.4 g applies to the individual watch inspected in this QC report. Bracelet sizing, production tolerances and individual configuration may result in small weight differences between watches.
Timegrapher Test Results
* Daily Rate: +8 Seconds/Day
* Amplitude: 310°
* Beat Error: 0.0 ms
* Beat Rate: 21,600 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 +8 seconds/day represents the movement’s performance at the time of inspection and should not be interpreted as a permanently fixed daily rate.
Modified 7750 Manual-Winding Movement
This SN Factory Rolex Daytona 6263 is equipped with a modified 7750 manual-winding chronograph movement.
Unlike an automatic movement, this configuration requires the wearer to supply power by manually winding the crown.
During this QC inspection, the movement recorded:
* Daily Rate: +8 Seconds/Day
* Amplitude: 310°
* Beat Error: 0.0 ms
* Beat Rate: 21,600 BPH
The recorded readings showed stable operation under the testing conditions.
For a manual-winding chronograph, QC should not rely solely on timegrapher data. Crown winding, time setting and the available chronograph functions should also be operated individually before shipment.
38mm Case Size and Dimensional Difference
The case of this individual watch measured 38.0 mm in diameter.
An important point to disclose is that the measured width differs by approximately 1 mm from the corresponding original specification used for comparison.
In normal viewing and wrist wear, a difference of this scale may be difficult to identify visually without direct measurement or side-by-side comparison. However, because this is a QC report, the actual measured dimension should be documented rather than omitted.
For buyers who place a high priority on exact dimensional matching, this difference should be considered before purchase.
98.4g Weight and Vintage Wearing Feel
The individual watch inspected weighed 98.4 g, giving it a noticeably lighter feel compared with many modern sports watches.
This lighter feeling is also influenced by the hollow-link style bracelet.
Modern solid-link bracelets generally feel heavier and denser in the hand. A vintage-style hollow bracelet can feel lighter, more flexible and may produce more movement or mechanical sound when handled.
These differences should not automatically be interpreted as poor quality.
They are part of the design character associated with older-generation sports watches and contribute to the distinctly different wearing experience of a vintage-style Daytona.
Hollow-Link Bracelet Characteristics
The hollow bracelet deserves particular attention because customers accustomed to modern solid-link bracelets may immediately notice the difference.
Typical characteristics can include:
* Lower overall bracelet weight
* More noticeable link movement
* A lighter feel on the wrist
* More mechanical sound when handled
* A different clasp and bracelet feel compared with modern designs
QC should therefore focus on whether the bracelet is assembled and functioning correctly rather than judging it by the weight and rigidity expected from a modern solid-link bracelet.
Important inspection points include link movement, end-link fit, bracelet alignment and clasp security.
QC Observations
The SN Factory Rolex Daytona 6263 is a model where the vintage construction and wearing experience need to be understood before purchase.
This individual watch measured:
* 38.0 mm case diameter
* 16.0 mm case thickness
* 98.4 g measured weight
The modified 7750 manual-winding movement recorded:
* +8 seconds/day
* 310° amplitude
* 0.0 ms beat error
* 21,600 BPH
Two characteristics are especially worth noting.
First, the measured case width has an approximately 1 mm dimensional difference from the original specification used for comparison. This may not be obvious to the naked eye during normal wear, but it is still relevant technical information and should be disclosed.
Second, the watch feels considerably lighter than many modern Daytona-style watches because of its vintage construction and hollow-link bracelet. The lighter weight and more flexible bracelet feel are therefore not, by themselves, evidence of a quality problem.
For buyers specifically looking for the proportions and tactile character of a vintage-style Daytona, these characteristics form part of the overall experience. Buyers expecting the weight and solid-bracelet feel of a modern sports watch should take these differences into consideration before purchase.
Pre-Shipment QC Inspection
* ✔️ Modified 7750 manual-winding movement checked
* ✔️ Timegrapher readings recorded
* ✔️ +8 seconds/day rate documented
* ✔️ 310° amplitude recorded
* ✔️ 0.0 ms beat error recorded
* ✔️ 21,600 BPH beat rate confirmed
* ✔️ Manual winding function checked
* ✔️ Crown operation inspected
* ✔️ Time-setting function checked
* ✔️ Available chronograph functions checked
* ✔️ Case diameter measured at 38.0 mm
* ✔️ Case thickness measured at 16.0 mm
* ✔️ Individual watch weight measured at 98.4 g
* ✔️ Hollow-link bracelet construction inspected
* ✔️ Bracelet link movement checked
* ✔️ End-link fit inspected
* ✔️ Clasp locking function checked
* ✔️ Dial and hand alignment inspected
* ✔️ Exterior finishing and overall assembly checked
* ✔️ Final pre-shipment QC inspection completed
