This Patek Philippe timepiece is a sophisticated tool watch that can keep track of time in multiple ways. It features a classic black dial with luminous gold hour markers for easy reading in low light conditions. The 40mm stainless steel case is water-resistant up to 394 feet, making it suitable for everyday wear and even light swimming. The automatic movement provides a 45-hour power reserve, ensuring the watch keeps running even when not worn for a day or two.