Audemars Piguet Royal Oak Automatic Ref. 15550BA.OO.1356BA.01

Case details
The case of this watch is made of high-quality 18K gold, which not only presents a dazzling metallic luster, but also gives the watch a sturdy and durable feature. The surface is equipped with a sapphire crystal glass mirror with anti-glare treatment, which effectively reduces reflection interference and ensures clear reading in various lighting environments. At the same time, the bottom cover is also made of sapphire crystal glass, allowing the wearer to fully appreciate the precise operation of the internal movement.
Size Specifications
Diameter: 37 mm, which can show the grand style of the watch and is suitable for a variety of wrist sizes.
Thickness: 9.3 mm, the overall design is thin and slender, and it is more comfortable to wear on the wrist without a sense of heavy oppression.
Waterproof depth: 50 meters, with a certain waterproof performance, can meet the waterproof needs in daily life, such as washing hands, raining and other scenes, but please avoid wearing it when swimming or diving.


Surface design
The surface is made of precious natural turquoise, and its unique color and texture are unique, adding a strong natural atmosphere and artistic sense to the watch. The gold three-dimensional hour markers and Royal Oak hands with fluorescent coating on the surface not only form a harmonious and unified visual effect with the 18K gold case, but also emit clear fluorescence in a dark environment to ensure accurate reading at night.
Strap and buckle
The strap is also made of 18K gold, which is consistent with the case material and the overall style is coordinated. The chain link design is tight and smooth, soft and comfortable to wear, and also has the characteristics of firmness and stability. With the exclusive AP folding buckle, it is not only convenient and quick to open and close, but also ensures that the watch is firm and safe during wearing and not easy to fall off.


Movement performance
Equipped with the brand's self-made 5900 movement, this is an excellent automatic winding movement, which fully reflects Audemars Piguet's profound technical background in the field of watchmaking.
Functions and parameters
Functions: It has the functions of hour, minute, central second hand and date display, which can meet the basic needs of daily time management.
Number of rubies: 29, these rubies are used as bearings in the movement, effectively reducing the friction between parts and improving the operation efficiency and service life of the movement.
Power reserve: The minimum guaranteed power reserve can reach 60 hours, and it can maintain operation for a long time even when not worn.
Total diameter: 26.2 mm, the movement size is exquisitely designed, perfectly matching the overall structure of the watch.
Number of parts: 188, each part is finely polished and assembled to ensure the precise and stable operation of the movement.
Balance frequency: 4 Hz (28,800 times/hour), the high-frequency swing makes the watch more accurate.
Thickness: 3.9 mm, the movement design is thin and light, which provides strong support for the overall thinness of the watch.