Hamilton Jazzmaster Open Heart 42mm Automatic Watch
How might this watch look on my wrist? A 3D representation of Hamilton Jazzmaster Open Heart 42mm Automatic Watch. Check retailer page for actual dimensions and specifications.
Scroll or drag to turn the wrist. Shown to scale on a typical men’s wrist (17.5 cm), lug to lug 48.2 mm (measured from the photo).
This 42mm stainless steel timepiece features an automatic movement with an 80-hour power reserve, displayed through an open heart aperture on the midnight blue aventurine dial. The case offers 50 metres of water resistance and is fitted with a scratch-resistant sapphire crystal. The watch sits on a stainless steel bracelet secured with a folding clasp, combining functional design with visible mechanical complexity typical of the Jazzmaster collection.
The open heart window reveals the oscillating balance wheel and escapement, allowing direct observation of the movement's operation. This design choice prioritises transparency over traditional dial symmetry, appealing to those interested in horological mechanics rather than conventional aesthetics.
The Hamilton Jazzmaster Open Heart 42mm Automatic Watch is listed on WatchShopper as a 42 mm stainless steel automatic watch with a midnight blue dial, sapphire crystal, and 50 m water resistance. It has an 80-hour power reserve and comes on a stainless steel bracelet. On 18 October 2026 the lowest UK price was £1,065.00 at Beaverbrooks, in stock, with free delivery and 30-day returns. With the voucher code GET50, Beaverbrooks brings it to £1,015.00.
At £1,065 this watch is mid-priced for an automatic watch with a 40–44 mm case: 45% of the 1,393 we track from every brand cost less. 81% of the 131 Hamilton watches we track cost less than this one. This is the 16th cheapest of the 22 versions of the Jazzmaster we list.
