It's a **replica** of the **Vacheron Constantin Overseas Perpetual Calendar Ultra-Thin** (likely a counterfeit version of reference 4300V). It features a 41.5mm rose gold-tone case and bracelet, a green dial with perpetual calendar complications (day, date, month, leap year, and moonphase), and 150-meter water resistance marking. **Note:** This is a fake—authentic Vacheron Constantin watches are luxury Swiss-made pieces retailing for over $70,000, not mass-market items.