The Hamilton Jazzmaster Open Heart Auto has a striking 42 mm stainless steel case that stands 11.4 mm tall. Designed for durability, it is water resistant up to 50 meters and features a sapphire crystal with an anti-reflective coating. The transparent case back allows a glimpse of the intricate inner workings of the watch. The dial boasts a smoky brown hue, showcasing the signature open-heart design that reveals the balance assembly within. For enhanced visibility in dim conditions, the applied hour markers and hands are coated with Super-LumiNova. This timepiece is powered by the Hamilton H-10 automatic movement, which beats at 28,800 vibrations per hour and provides an impressive 80-hour power reserve. Additionally, the movement features a Nivachron balance spring, ensuring greater resistance against magnetic fields, temperature fluctuations, and shocks. Completing the look is a brown leather strap that is secured with a pin buckle.