Hamilton

Open Heart Auto

Reference Number :

H32705731

Series : Jazzmaster

Retail: $1,145

(As of: 07/2025)

This watch is not for sale, this page is just for reference purposes only. If you would like to purchase this watch, please contact Hamilton. If you are interested in selling this watch to us, you can contact us here.

Quick TakeThere is a captivating honesty to the Jazzmaster Open Heart. It doesn't just present the time; it performs it for an audience of one. The watch surrenders its secrets willingly, with surgical cutaways on the black dial that serve as a backstage pass to the mechanical theater within. You can see the rhythmic pulse of the balance wheel, a tangible heartbeat powered by the robust H-10 automatic movement. This isn't just a gimmick; it is a declaration of confidence in its own engineering, offering an impressive 80-hour power reserve that keeps the show running all weekend long. Encased in a confident 42mm of stainless steel and sealed with a near-indestructible sapphire crystal, it has a commanding presence. The feel of the calf leather strap and the secure click of the folding clasp complete an experience that is both intellectually stimulating and deeply satisfying. It's a watch for those who appreciate that the how is just as important as the now.

DescriptionThe H32705731 model is engineered with a circular stainless steel case that possesses a diameter of 42mm and a vertical profile measuring 11.44mm in thickness. This case construction ensures water resistance up to 5 bar, which translates to a static pressure tolerance at 50 meters or 73 pounds per square inch. Protecting the dial is a sapphire crystal, selected for its superior hardness and resistance to abrasion. This crystal is further enhanced with an anti-reflection treatment to improve dial legibility in direct light. The exhibition-style open case back provides a secondary view of the internal movement. The lugs are spaced 22mm apart to integrate the strap, which tapers to a 20mm buckle width and is secured by a folding clasp.

Powering the timepiece is the Hamilton Caliber H-10, a self-winding three-hand movement. A key functional attribute of this caliber is its extended power reserve, capable of storing up to 80 hours of operational energy. The movement, which omits a date function, is decorated with elaborate contrasting snail and pearled patterns visible through the dial's distinctive apertures. This open-heart design element on the black dial exposes the inner workings of the escapement and balance wheel. The supplied strap, bearing the reference H6004251031, is fabricated from calf leather for a combination of aesthetic appeal and wearer comfort.

GenderMen

SignaturesHamilton

Country of OriginSwitzerland

Case Size42 mm

MovementAutomatic

CaliberH-10

FunctionsHours, Minutes, Seconds

Power Reserve80 Hours

Case MaterialsStainless Steel

Bezel MaterialsStainless Steel

Lug MaterialsStainless Steel

Case BackSapphire Crystal