The silver dial is one of the most iconic colour schemes of the Audemars Piguet Royal Oak, and it demands even greater precision in the guilloché finish than darker dials. The silver dial of the genuine 26240ST features the ‘Grande Tapisserie’ large checkered pattern, with each square meticulously crafted using the hand-engraving techniques passed down within the Audemars Piguet workshops. This process involves 12 distinct stages and takes approximately seven hours to complete. When rotated under light, the three-dimensional pyramid-shaped raised elements of the genuine guilloché pattern produce a subtle play of light and shadow, whilst the texture of the silver lacquer is as uniform as silk. Although the BLS factory has made every effort to replicate the arrangement of the pattern, examination under a magnifying glass reveals significant discrepancies in the consistency of the pattern’s depth and the sharpness of the square edges. Most crucially, there is a subtle difference in lustre between the genuine silver sub-dial and the main dial—the main dial has a slightly matt finish, whilst the sub-dial exhibits a faint sunburst effect; this sense of depth is difficult for BLS to replicate. Furthermore, the ‘AUDEMARS PIGUET’ lettering on the genuine silver dial is applied using a transfer printing process, resulting in sharp, clean-edged lettering, whereas the replica often reveals ink smudges or uneven stroke thickness when viewed under a magnifying glass. 
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The case craftsmanship is the essence of the Audemars Piguet Royal Oak series, and it is the area where the BLS factory differs most significantly from the genuine product. The case of the genuine 26240ST model is made of stainless steel and undergoes a combination of top-level polishing and sanding processes. According to the official service information of Audemars Piguet, a Royal Oak case requires 24 bevels and 16 screw heads to be polished, and 27 different surfaces need to be processed through various types of fine processing such as polishing and satin finish. This means that every edge of the genuine case maintains perfect geometric sharpness, the sanding lines are fine and uniform in direction, and the mirror chamfer is as transparent as glass. The case of the BLS factory replicates the octagonal shape in appearance, but fails to handle the details well. The sanding texture is often too rough or inconsistent in direction, and the chamfered polishing areas often have an arc transition instead of the sharpness of the genuine product's "knife-edge". The eight hexagonal screws on the bezel are also key points for identification - the polished slots of the genuine screws are extremely deep, with the one-line slot ends rounded and ending in a circular shape, and they are perfectly flush with the case plane; the screws of BLS often have metal burrs and are prone to getting stuck in the case too deep or protruding. 
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The pointer serves as the visual focal point of the dial, and its manufacturing precision directly affects the sophistication of the entire wristwatch. The genuine 26240ST features white gold luminous three-dimensional hour markers and Royal Oak royal oak-shaped pointers. Both the hour markers and the pointers are made of white gold and undergo high polishing treatment. Against the silver dial, they present a warm metallic luster. The most crucial aspect is the pointer axis - the pointer axis of the genuine Royal Oak chronograph watch is designed with a solid structure and is finely polished, presenting a perfect "cap cover" shape with sharp edges without any reflective burrs. BLS factories are prone to exposing problems here. The axis is often hollow or, although solid, is rounded and lacks the sharpness of the genuine product's "one-cut" feel. Additionally, the balance weight part of the large seconds hand of the genuine watch has clear proportions and chamfering, while BLS often makes it too thick or has an inaccurate shape. In terms of the night light coating, the genuine product uses Super-LumiNova night light material, which is filled evenly and flatly with a slight curvature, and even when there is insufficient light absorption, it presents a white ceramic texture; BLS's night light filling often has bubbles or unevenness, and the night light duration and brightness are far inferior to the standard of the genuine product. 
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The crown serves as the sole interface between the wearer and the movement. Its feel and detailed craftsmanship are crucial indicators to distinguish genuine products from imitations. The 26240ST model is equipped with a screw-down crown. The "AP" logo on the outer side of the crown is not simply etched but is instead produced through stamping or embossing techniques, giving it a strong three-dimensional effect. The spacing and proportion of the two letters have been meticulously designed. The teeth of the crown are extremely sharp and deep, providing excellent grip when the finger rotates it. The thread feedback during the screw-out and locking process is smooth and silent, thanks to the brand's strict control over the sealing ring material and thread accuracy. The crowns produced by the BLS factory usually have obvious shortcomings: Firstly, the font of the "AP" logo is either too thick or too thin, and the depth is insufficient, making it look like it was etched later rather than being formed as one piece; Secondly, the teeth of the crown are not finely ground, and the edges often have a rough feel. In terms of water resistance, the genuine product ensures a 50-meter water resistance depth and can be worn while washing hands, while the BLS product suffers from a significant reduction in water resistance due to differences in the sealing ring material and assembly process. Additionally, the gap between the crown and the case of the genuine product is extremely precisely controlled, fitting perfectly with the contour of the case when screwed in, while the BLS products often have uneven gaps or overly raised areas. 
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This is the most insurmountable technical gap between the BLS version and the genuine product, and it is also the fortress that no replication factory can truly break through. The genuine 26240ST is equipped with an in-house Calibre 4401 automatic winding movement. This movement features a fly-back chronograph function, a power reserve of up to 70 hours, and is composed of 381 components. The oscillation frequency is 28,800 beats per hour. Through the transparent sapphire bottom cover, one can appreciate the exquisite finishing of the movement - Geneva waves, pearl patterns, bevel polishing, etc. are all meticulously crafted. The 22K gold automatic rotor is engraved with the AP family emblem, and the balance wheel is positioned at the 7 o'clock position. It uses a KIF shock absorber and an open-coil hairspring structure. Although the BLS factory has recently launched a "single movement" replica version to imitate the appearance layout of the 4401, its essence is mostly a combination of the Dan Dong or Shanghai 7750 movements with decorative plates. The identification points are clear: First, the shock absorber - the imitations are almost all domestic triangular shock absorbers, rather than the KIF shock absorbers of the genuine product; Second, the balance wheel structure - the imitations have a locking mechanism, with a quick and slow adjustment device on the balance wheel, while the genuine product has an open-coil structure and adjusts the speed through the weight on the balance wheel; Third, the plate finishing - the imitations can handle the visible parts well, but in the joint gaps and edges, they are often rough, and the gears lack the metal luster and tooth chamfering treatment of the genuine product.文章源自表探-https://www.bbtwatch.com/en/dj/appc/122854.html
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