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The Hamilton Jazzmaster Open Heart Auto 40mm H32675501 features a stainless steel case measuring 40 mm in diameter and 11.1 mm in height. The case is water resistant to 50 metres and fitted with a sapphire crystal with anti-reflective coating. The case back is transparent. The dial is executed with a gradient finish, transitioning from rich golden tones at the centre to darker hues towards the outer edge. The collection’s characteristic open-heart aperture reveals portions of the movement beneath. Applied hour markers and hands are treated with Super-LumiNova for enhanced legibility in low-light conditions. Power is provided by the Hamilton H-10 automatic calibre, operating at 28,800 vibrations per hour and offering a power reserve of 80 hours. The movement incorporates a Nivachron balance spring to improve resistance to magnetic fields, temperature variations and shocks. The watch is fitted with a brown leather strap secured by a pin buckle.