Product Information
* Factory: BLS Factory
* Brand: Audemars Piguet
* Collection: Royal Oak Chronograph
* Reference: 26240
* Movement: 4401 Automatic Chronograph Movement
* Movement Design: Free-Sprung Balance
Technical Specifications
* Case Diameter: 41.0 mm
* Case Thickness: 12.5 mm
* Measured Weight: 171 g*
* Crystal: Sapphire Crystal (Front & Exhibition Caseback)
*The 171 g figure represents the measured weight of the individual watch inspected for this QC report. Minor variations may occur between individual watches due to manufacturing tolerances and configuration differences.
Timegrapher Test Results
* Daily Rate: +9 Seconds/Day
* Amplitude: 289°
* Beat Error: 0.3 ms
* Beat Rate: 28,800 BPH
Testing Note
The timegrapher readings above were recorded from this individual watch during its pre-shipment QC inspection. Mechanical movement performance can vary depending on mainspring power, watch position, temperature and testing conditions.
Key Point Observed During QC
One feature worth noting on this BLS Factory 26240 is the use of a free-sprung balance movement architecture. At this price level, this movement configuration adds technical interest to the watch and is one of the details worth considering when evaluating the overall specification.
Rather than judging the watch solely by exterior appearance, the movement configuration, chronograph operation and actual timegrapher readings provide additional reference points when assessing this version.
Pre-Shipment QC Inspection
* ✔️ Movement operation checked
* ✔️ Chronograph start, stop and reset functions tested
* ✔️ Crown winding and time-setting functions checked
* ✔️ Free-sprung balance movement visually inspected
* ✔️ Case dimensions measured
* ✔️ Individual watch weight measured
* ✔️ Front sapphire crystal inspected
* ✔️ Exhibition caseback inspected
* ✔️ Dial, hands and hour-marker alignment checked
* ✔️ Bezel and exterior finishing visually inspected
* ✔️ Bracelet and clasp operation checked
* ✔️ Final pre-shipment inspection completed
