Vacheron Constantin Patrimony "31 Day Retrograde"

• Case: ~37mm, 18K white gold, fixed bezel, transparent sapphire case back
• Dial: Silver opaline dial with Maltese cross logo under "VACHERON CONSTANTIN GENEVE"
• Complications: Retrograde 31-day date scale (the "25·27·29·31·1·3·5·7·9…" numerals at upper right), a day-of-week sub-dial (FRI/SAT/SUN/MON) at left, and a power-reserve arc at 6 o'clock
• Hands: Dauphine-style hour/minute hands, with separate pointer hands for the retrograde date and day
• Movement: In-house automatic caliber, ~38-40 hour power reserve
• Strap: Black alligator leather with a white gold buckle

This model is part of VC's Patrimony line, known for its clean, understated dress-watch aesthetic with unusual retrograde displays instead of standard date windows. Rose gold and platinum versions also exist.