<p class="font_8">**Audemars Piguet Royal Oak Blue Model 15500ST.OO.1220ST.01 Review by A.I. WatchMetrics**

### Watch Summary

The Audemars Piguet Royal Oak Blue Model 15500ST.OO.1220ST.01 is a quintessential example of the luxury sports watch category, known for its iconic design and high craftsmanship. This model features a striking blue "Grande Tapisserie" dial, housed in a stainless steel case with a matching bracelet, embodying the brand's signature aesthetic. The watch is powered by the in-house automatic caliber 4302, offering a robust power reserve of 70 hours. This Royal Oak is ideal for collectors and enthusiasts who appreciate a blend of elegance and sportiness, making it suitable for both formal and casual settings. Its appeal lies in its historical significance as a pioneering luxury sports watch and its continued relevance in modern horology.

### Overall Watch Rating: 8.5/10.0

- **Dials &amp; Design Metric (9.5/10.0)**
The Royal Oak's design is iconic, with its octagonal bezel and integrated bracelet. The blue "Grande Tapisserie" dial adds depth and sophistication, showcasing exceptional craftsmanship and originality.

- **Brand Metric (9.0/10.0)**
Audemars Piguet is a high-end luxury brand with a strong heritage and global recognition. The Royal Oak line is particularly renowned for its influence on the luxury sports watch market.

- **Movement Metric (9.0/10.0)**
The watch is equipped with the in-house caliber 4302, known for its precision and 70-hour power reserve. The movement's technical complexity and finishing quality contribute significantly to the high score.

- **Material Metric (8.8/10.0)**
The use of high-quality stainless steel with a fine brushed finish and polished accents exemplifies luxury craftsmanship. The material choice is both durable and aesthetically pleasing.

- **History &amp; Innovation Metric (8.5/10.0)**
The Royal Oak is historically significant as one of the first luxury sports watches, designed by Gérald Genta. Its innovative design continues to influence watchmaking.

- **Functions Metric (8.5/10.0)**
The watch offers practical features such as water resistance suitable for daily wear and a clear, legible dial. Its robust construction enhances its functionality.

- **Rarity Metric (8.0/10.0)**
While the Royal Oak is a well-known model, its desirability and limited production runs contribute to its exclusivity and high demand in the market.

- **Versatility Metric (8.0/10.0)**
The Royal Oak's design allows it to transition seamlessly between formal and casual settings, making it a versatile choice for various occasions.

- **Complications Metric (7.5/10.0)**
The watch features a date complication, which is well-integrated into the design. While not highly complex, it adds to the watch's practicality.

### Celebrity and Historical Figures

The Audemars Piguet Royal Oak is favored by numerous celebrities and public figures. Notably, actor Tom Cruise and musician Jay-Z have been seen wearing the Royal Oak, highlighting its status as a symbol of luxury and style. The model's association with influential personalities underscores its appeal and prestige in the world of horology.</p>