Hamilton Jazzmaster Open Heart 42 Stainless Steel / Aventurine Ref. H32705640

The Hamilton Jazzmaster Open Heart 42 mm H32705640 was introduced in 2025. It is a 42 mm stainless steel Jazzmaster model with an open-heart dial and a blue aventurine-style finish. This reference has a stainless steel case measuring 14.95 mm thick, with a lug-to-lug length of 50 mm and a lug width of 22 mm. It is fitted with a sapphire crystal with anti-reflective coating, a see-through case back, and is water-resistant to 5 bar, or 50 meters. The blue aventurine dial has openworked sections that reveal parts of the movement below. Time is indicated by central hour, minute, and seconds hands. The dial design combines the Jazzmaster Open Heart layout with a dark blue, speckled finish inspired by aventurine glass. Inside is the Hamilton H-10, an automatic movement with an 80-hour power reserve. It is fitted with a Nivachron balance spring. The watch is fitted with a blue leather strap.