Vacheron Constantin Overseas Perpetual Calendar 4300V/000R-B509

This is where sport meets true horology.

The Vacheron Constantin Overseas Perpetual Calendar in 18k rose gold takes one of the most respected complications in watchmaking and integrates it into a case designed for everyday wear. At 41.5mm, it carries presence, but the ultra-thin profile keeps it refined—something rarely achieved with a perpetual calendar.

The blue dial is laid out with clarity and balance—day, date, month, leap year, and moonphase all working together without feeling crowded. It’s complex, but intentional. The kind of design that reveals itself over time rather than all at once.

Powered by the Caliber 1120 QP/1, this piece delivers approximately 40 hours of power reserve and tracks the perpetual calendar accurately through 2100 without adjustment. It’s not just mechanical—it’s architectural.

Despite the level of complication, it wears easily. The Overseas platform, paired with the integrated strap system, gives it a versatility most perpetual calendars don’t have.

This is for the collector who understands what goes into a piece like this—and prefers to wear it, not just store it.

Key Details

• Reference: 4300V/000R-B509
• Case Size: 41.5mm
• Material: 18k Rose Gold
• Dial: Blue
• Functions: Perpetual Calendar (Day, Date, Month, Leap Year), Moonphase, Time
• Movement: Caliber 1120 QP/1
• Power Reserve: ~40 hours
• Strap: Integrated strap system (interchangeable)

Our Take

Perpetual calendars tend to live in dress watches—this is one of the few that doesn’t. The Overseas platform changes how the complication is worn, not just how it’s viewed.

For collectors who want serious watchmaking without sacrificing versatility, this is where the conversation gets interesting.

Set Contents

This like-new 2021 example comes as a complete set including:

• Reference 4300V/000R-B509 confirmed on the Vacheron Constantin certification (papers).
• Full set includes inner and outer box, warranty card, booklets, and push-pin tool. 
• Watch is secured by the signature blue leather and blue sport rubber straps.