The Hamilton Jazzmaster Open Heart Auto, ref. H32675540: the 40mm automatic dress watch with a smoked blue dial and a precision aperture at nine o’clock that exposes the oscillating balance wheel of the H-10 movement, worn by Terence Rosemore as Otis Berg, Lex Luthor’s assistant, in James Gunn’s Superman (2025), where a watch designed to make the invisible mechanism of timekeeping visible is placed on the wrist of a character who exists to make the invisible workings of a villain’s ambition slightly more visible, and slightly more comic.
James Gunn’s Superman (2025) populates Lex Luthor’s world with a supporting cast drawn from decades of Superman mythology, and among the characters carried forward from the original film tradition is Otis Berg, played by Terence Rosemore. Otis is the assistant, the henchman, the man whose function in the story is to execute Luthor’s instructions with a level of competence that falls just short of what the instructions require. Ned Beatty originated the role in Richard Donner’s Superman (1978), establishing the character as a source of comedy in a film that used comedy strategically to leaven the weight of a story about power, isolation, and the difficulty of doing good in a world that does not always want it.
Rosemore’s Otis Berg wears the Hamilton Jazzmaster Open Heart Auto H32675540, confirmed directly on Hamilton’s official product page: “Featured in Superman: Legacy (2025). Worn by Otis Berg, played by Terence Rosemore.” The watch is a 40mm automatic with a smoked blue dial and an open heart aperture at nine o’clock, through which the balance wheel of the H-10 movement is visible in continuous oscillation. The case is polished stainless steel on a brown leather strap with a stainless steel tang buckle. It is a dress watch in the contemporary idiom: neither the military field watch austerity of Jimmy Olsen’s Khaki Field Mechanical nor the technical aviation vocabulary of some of Hamilton’s other film appearances, but the refinement of a watch designed for occasions that require a certain amount of presentation without requiring the full commitment of luxury.
On Otis Berg’s wrist, the open heart becomes a small involuntary joke. A watch that makes its own inner workings visible, on the wrist of a man whose function is to carry out operations whose inner workings his employer prefers to keep invisible, is the kind of costume detail that functions below the level of conscious audience attention while contributing to the overall coherence of the character’s visual construction. Otis is the mechanism that shows.
More on the film: imdb.com/title/tt5950044 and on the watch: hamiltonwatch.com/en-int/h32675540-jazzmaster-open-heart-auto.html
The Open Heart: Five Centuries of Made Visible
The open heart complication belongs to a tradition of skeleton and exhibition watchmaking that extends back to the sixteenth century, when European clockmakers began cutting away the solid plates of their movements to display the gear trains beneath. The motivations were partly practical, allowing the owner to monitor the state of the movement, and partly aesthetic, demonstrating that the object contained a mechanism of genuine complexity rather than concealing an inferior movement behind a decorated dial.
The specific form of the open heart, a single aperture in the dial positioned to reveal the balance wheel rather than the full movement, is a refinement of this tradition that dates to the twentieth century and has been employed by watchmakers across the price spectrum from entry-level fashion watches to haute horlogerie complications. The balance wheel is the correct choice for this exposure: it is the most visually active element of a mechanical movement, oscillating back and forth at its defined frequency in a continuous motion that is immediately legible as the heart of the timekeeping mechanism. A skeleton dial can overwhelm the viewer with mechanical information; an open heart focuses the attention on a single oscillating element and makes its function self-evident.
Creation Watches’ 2026 review of the Jazzmaster Open Heart describes the complication accurately: “it is not a tourbillon, which actively compensates for gravity, and it is not a full skeleton dial, where the entire movement is visible. It is a precision cutout that exposes the balance wheel and nothing else.” At Hamilton’s price point, the review notes, the complication is genuinely remarkable, delivering the visual drama of a far more expensive category of watch at a price that places it within reach of the mid-market consumer.
The H-10 and the Jazzmaster Collection
The movement inside the H32675540 is Hamilton’s proprietary H-10 automatic calibre, a Swiss-made movement with an 80-hour power reserve that distinguishes the current Jazzmaster Open Heart from its predecessors, which used the ETA 2824-2 with a more conventional 38 to 42-hour reserve. The H-10 is a significant practical improvement for a dress watch: 80 hours means the watch runs from Friday evening through to Monday morning without attention, a specification that changes the ownership experience of a watch worn for evening occasions and weekend use rather than daily office wear. The movement is visible through the exhibition sapphire caseback as well as through the dial aperture, giving the owner two distinct perspectives on the mechanism.
The Jazzmaster collection was conceived as Hamilton’s contemporary dress and lifestyle line, drawing on the brand’s American heritage without the military vocabulary of the Khaki Field or the aviation vocabulary of the Khaki Pilot. The name invokes the American jazz tradition, the musical form that emerged from the same mid-twentieth century American cultural moment that shaped the brand’s commercial identity during its Lancaster years, and the collection’s design language is correspondingly oriented toward the urban and the cultivated rather than the outdoor and the functional.
The H32675540 specifically, in its smoked blue dial with diamond-shaped polished markers and sword-style luminous hands, occupies the more contemporary end of the Jazzmaster aesthetic. The smoked blue is a dial treatment that draws the eye toward the centre and toward the aperture at nine o’clock, creating a gradient effect that the Creation Watches review describes as immediately striking in a way that rewards close attention. The brown leather strap with its matching stitch provides a warm counterpoint to the blue and steel of the watch head, a combination that reads as contemporary dress rather than either formal or casual.
Two Hamilton Watches for Two Sides of Metropolis
The presence of two distinct Hamilton references in Superman (2025), the Khaki Field Mechanical H69439531 on Jimmy Olsen and the Jazzmaster Open Heart H32675540 on Otis Berg, represents a costume department deployment of the same brand in two entirely different registers. The Khaki Field is the watch of the working press photographer: military heritage, hand-wound movement, NATO strap, maximum legibility, minimum elegance. The Jazzmaster Open Heart is the watch of the villain’s assistant: dress orientation, automatic movement, leather strap, visible complication, a watch designed for occasions rather than assignments.
The character contrast the two watches articulate, between the Daily Planet’s earnest photographer and Lex Luthor’s quietly hapless aide, is the same contrast that the two watches articulate between Hamilton’s military and dress collections. The brand’s partnership with DC Studios as official watchmaker of the DC Universe has produced, in this film alone, a precise and coherent watch map of Metropolis: one watch for the press corps, one watch for the antagonist’s team, and an entire city of stories waiting to be told on the wrists of the characters who populate it.
The H32675540 also appears in Steven Spielberg’s Disclosure Day (2026), worn by Colin Firth, confirming the watch’s emergence as one of Hamilton’s more visible film references in the current production cycle and extending the Jazzmaster Open Heart’s screen biography beyond the DC Universe and into Spielberg’s first film in several years.
Technical note: Hamilton Jazzmaster Open Heart Auto, ref. H32675540. Polished stainless steel case, 40mm diameter, 11mm thickness. Fixed polished bezel. Smoked blue dial with open heart aperture at 9 o’clock exposing the balance wheel. Polished diamond-shaped markers, sword-style luminous hands, outer minute track. No date. H-10 calibre, Swiss automatic, 80-hour power reserve, exhibition sapphire caseback. Sapphire crystal, scratch-resistant. Brown leather strap with matching stitch, stainless steel tang pin buckle with Hamilton emblem. Water resistance 50 metres. Original retail price approximately $795 USD. The open heart aperture exposes the oscillating balance wheel of the H-10 movement; the H-10 replaces the earlier ETA 2824-2 used in previous Jazzmaster Open Heart variants. Hamilton is the official watchmaker of DC Studios. Featured in Superman (2025), directed by James Gunn, worn by Terence Rosemore as Otis Berg, Lex Luthor’s assistant; character originated by Ned Beatty in Superman (1978), directed by Richard Donner. The same reference H32675540 subsequently appears in Disclosure Day (2026), directed by Steven Spielberg, worn by Colin Firth as Noah Scanlon.
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Details
Brand:
Marketplace Price
€1 100
Movie Year:
2025
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