<p class="font_8">**Vacheron Constantin Perpetual Calendar Ultra-Thin Gold Model 4300V/120R-B509 Review by A.I. WatchMetrics**

### Watch Summary

The Vacheron Constantin Perpetual Calendar Ultra-Thin Gold Model 4300V/120R-B509 is a masterpiece of haute horology, epitomizing elegance and technical sophistication. Classified as a Formal/Business watch, it features an ultra-thin case crafted from 18k rose gold, making it ideal for black-tie events and professional settings. This timepiece is powered by the in-house Caliber 1120 QP, an automatic movement with a perpetual calendar complication, showcasing Vacheron Constantin's expertise in crafting complex mechanisms. With a power reserve of approximately 40 hours, it is designed for the discerning collector who values both aesthetic refinement and horological innovation. The watch's appeal lies in its exquisite craftsmanship, historical significance, and the prestige associated with the Vacheron Constantin brand, making it a coveted piece for connoisseurs and collectors alike.

### Overall Watch Rating: 8.8/10.0

- **Functions Metric (9.5/10.0)**
The watch features a perpetual calendar, a highly complex and practical function that automatically adjusts for varying month lengths and leap years. Its water resistance is suitable for everyday wear, and the exhibition caseback offers a view of the beautifully finished movement.

- **Complications Metric (9.3/10.0)**
The perpetual calendar is an advanced complication, rare and highly valued in the watchmaking world. This feature significantly enhances the watch's complexity and desirability.

- **Movement Metric (9.0/10.0)**
The in-house Caliber 1120 QP is a marvel of engineering, known for its ultra-thin profile and reliable performance. Its automatic winding mechanism and perpetual calendar complication demonstrate Vacheron Constantin's technical prowess.

- **History &amp; Innovation Metric (8.9/10.0)**
Vacheron Constantin's rich history and continuous innovation in watchmaking are exemplified in this model. The brand's legacy in crafting perpetual calendars adds historical significance to the watch.

- **Dials &amp; Design Metric (8.8/10.0)**
The dial features a classic design with applied markers and a moonphase display, showcasing exceptional craftsmanship and attention to detail.

- **Material Metric (8.7/10.0)**
Crafted from 18k rose gold, the watch exhibits high-quality materials and exquisite finishing, enhancing its luxury appeal.

- **Versatility Metric (8.5/10.0)**
While primarily a formal watch, its timeless design allows for versatility in various elegant settings, though it is less suited for casual or sporty environments.

- **Rarity Metric (8.4/10.0)**
Limited production and the use of precious materials contribute to its exclusivity, making it a rare and sought-after piece.

- **Brand Metric (8.2/10.0)**
Vacheron Constantin is a prestigious brand with a strong heritage in haute horology, known for its exceptional craftsmanship and innovation.

### Celebrity and Historical Figures

Vacheron Constantin watches have been favored by numerous celebrities and historical figures. Notably, the brand has been worn by royalty and dignitaries, including King Farouk of Egypt and the Duke of Windsor. While specific individuals associated with this model are not documented, the brand's association with high-profile personalities underscores its status and appeal.</p>