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The Hamilton Jazzmaster Open Heart Auto 42mm H32705180 is part of the Jazzmaster collection and features a stainless steel case measuring 42 mm in diameter and 11.4 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 black dial features a sunray-brushed finish with smoky accents and the collection’s signature open-heart aperture, revealing portions of the balance assembly. Applied hour markers and hands are treated with Super-LumiNova to enhance legibility in reduced 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 is equipped with a Nivachron balance spring for improved resistance to magnetic fields, temperature variations and shocks. The watch is fitted with a stainless steel bracelet secured by a folding clasp.