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The Hamilton Jazzmaster Open Heart Auto 40mm H32675181 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. A transparent case back reveals the movement. The dial is executed in a light, silver-toned sunray finish with subtle smoky shading towards the outer edge. The collection’s characteristic open-heart aperture provides a view of the balance assembly and part of the automatic movement beneath. Applied hour markers and hands are treated with Super-LumiNova to enhance legibility in low-light conditions. Inside is the Hamilton H-10 automatic calibre, beating at 28,800 vibrations per hour and delivering 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 paired with a brown leather strap secured by a pin buckle.