Back in 1975, Delma introduced the Shell Star as its first purpose-built professional dive watch. Even now, the model still occupies a cornerstone role in the Swiss brand’s contemporary catalog. The modern Shell Star diver is a significantly more capable timepiece than the original model that debuted over half a century ago, but it is also a rather burly timepiece, which slightly hinders its ability to casually exist in everyday environments. That said, among Delma’s releases for 2026 is a smaller and more wearable execution of the Shell Star that is available in either a quartz or automatic format. The Delma Shell Star 41mm lineup spans five different colorways, along with the option of either strap- or bracelet-equipped configurations.
The Shell Star is hardly Delma’s only dive watch, and the Swiss brand produces a variety of different underwater timepieces, with the latest generation of its Blue Shark series offering a whopping 5,000-meter depth rating. While it isn’t the most capable diver in Delma’s modern catalog, the Shell Star is arguably the most important from a historical context, and its chunky tonneau-shaped profile even informs the silhouette of the brand’s 1924 Tourbillon watch that was created to celebrate Delma’s landmark 100th anniversary. It’s also worth noting that the current Delma Shell Star isn’t a vintage-inspired reissue piece, and it instead reimagines core thematic elements of the original 1975 model (such as orange accents and a tonneau-shaped case) to create a thoroughly modern interpretation of a rugged purpose-built diver.
Over the years, Delma has produced a handful of different versions of the Shell Star, including limited editions with bronze and DLC-coated cases. That said, the current generation of the brand’s flagship Shell Star Automatic adheres to a sizable 44mm format, and it is equipped with a helium gas escape valve and a 500-meter depth rating, which firmly places it into the realm of serious purpose-built tool watches. The standard 44mm Shell Star Automatic is objectively a very capable timepiece, but even hard-core commercial divers aren’t likely to require the upper limits of its capabilities, and the smaller Delma Shell Star 41mm distills the core design of the full-size flagship model into a more compact and wearable expression of the brand’s quintessential dive watch.
The Delma Shell Star 41mm is available with either a quartz or automatic movement, and each version of the model is offered with the option of five different dial colors, plus the choice between a rubber strap and a stainless steel bracelet. Unlike some brands that only offer certain configurations for specific colorways, Delma offers every possible configuration for the Shell Star 41mm (a total of 20 different options), which means that buyers can have the exact movement type, dial color, and strap/bracelet combination of their choice. As a consumer, I appreciate when watch brands opt for this approach, as it simplifies the process of choosing a model, and buyers are free to focus on selecting the colors/features that best suit their individual preferences, without facing any arbitrary restrictions on possible combinations.
Regardless of configuration, all of the Delma Shell Star 41mm models are crafted from 316L stainless steel with a brushed and polished finish, and they offer 200 meters of water resistance, which is still more than enough to contend with any real-world scuba diving. Similarly, all of the Shell Star 41mm models are furnished with gently domed sapphire crystals, which are surrounded by 120-click unidirectional timing bezels that are fitted with matching brushed stainless steel inserts. Similar to other Delma watches, the action of the bezel is crisp and precise with virtually zero perceptible black-play in its motion, and just as you would expect, the signed crown features a screw-down design to help guarantee the 200-meter depth rating that is offered by the Shell Star 41mm series.
Where the quartz and automatic versions of the Delma Shell Star 41mm begin to differ is when it comes to their case height, and this is simply due to the different styles of casebacks that are fitted to each model. Both versions measure 41mm in diameter by 47.5mm in the lug-to-lug direction, but the quartz models are fitted with solid screw-on casebacks that result in a total height of 11.7mm, while their automatic siblings receive slightly thicker display-style casebacks, which bring their height up to 12.8mm. In both instances, the Shell Star 41mm models are a millimeter thinner than their 44mm counterparts, and this reduction in height has been achieved by eliminating the helium escape valve from the 9 o’clock side of the dial. Given that only a tiny fraction of divers actually require helium escape valves, I fully support Delma’s decision to omit this feature from the Shell Star 41mm series, and the reduction in case thickness translates to a more comfortable on-wrist experience.
Despite their reduced dimensions, the Delma Shell Star 41mm models are still relatively large and chunky watches, but just like their larger 44mm siblings, the cases of the 41mm models incorporate several design elements that help accommodate smaller wrists. The burly tonneau-shaped case of the modern Shell Star series inherently offers ample wrist presence, but its lug-to-lug profile is fairly compact (at least relative to its diameter), and the concave profile of the Shell Star’s screw-on caseback allows the watch to wrap around the wrist (rather than sitting on top of it), which further reduces on-wrist perceptions of its height. My wrists measure about 6.5 to 6.75 inches in circumference, and the Shell Star 41mm is more appropriately sized for my wrist, while still feeling like a burly professional dive watch.
At the time of writing, Delma offers the Shell Star 41mm with the option of five different dial colors (black, white, yellow, light blue, and orange), and the only difference between the dials fitted to the quartz and automatic models is that the quartz versions feature the word “professional” in place of the “automatic” text on the lower half of their displays. Just like their larger 44mm siblings, the Shell Star 41mm models receive a subtle vintage-inspired flair from their checkerboard-style minute tracks, and all five colorways are entirely devoid of reflective elements, with the frames for their hands and indexes receiving a contrasting painted finish to provide ample visibility against their matte grain-textured dials.
As a small nitpick, Delma uses the exact same handset for all five colorways of the Shell Star 41mm, and since the seconds hand is partially finished orange, this creates a slight lack of contrast on the duo of models with orange dials. Personally, I don’t find it especially hard to see the seconds hand against the orange-colored dials, but a white-finished tip would undeniably improve their overall visibility. Additionally, to further help promote low-light legibility, two different colors of C5 Super-LumiNova are used on the Shell Star 41mm models. While all of the lume appears white in the daylight, the hands and the luminous triangle on its bezel glow green, and the hour markers emit an aqua blue-colored glow in the dark.
The quartz versions of the Delma Shell Star 41mm are powered by the ETA F06.115 movement, which runs on a single 371 power cell that provides it with a battery life of approximately 68 months. Along with having an end-of-life indicator that alters the motion of its seconds hand to alert owners of a low battery, the Cal. F06.115 is also equipped with ETA’s HeavyDrive anti-shock technology, which automatically detects impacts and sends a counter force through the movement’s motor to lock the hands in place and prevent damage. Although the ETA F06.115 isn’t thermo-compensated like certain premium quartz movements, it is universally regarded as a reliable design, and its integrated HeavyDrive technology makes it perfectly suited for use inside a rugged diver like the Shell Star 41mm.
Meanwhile, the automatic versions of the Shell Star 41mm receive the familiar Sellita SW200-1, which operates at a rate of 28,800vph (4 Hz) with a power reserve of approximately 41 hours. The same exact movement can be found inside Delma’s full-size 44mm Shell Star Automatic models, and its proven design (along with its ease of serviceability) has made the venerable SW200 the most commonly used Swiss-made automatic movement in the entire watch industry. The version of the Sellita SW200-1 that Delma uses inside the Shell Star 41mm isn’t chronometer-certified or decorated to premium standards, but it is fitted with a custom gold-plated rotor, and unlike the quartz versions, the automatic models display their movements through circular windows in their casebacks.
The bracelet that Delma offers for the Shell Star 41mm series is essentially a narrower version of what can be found on the brand’s full-size Shell Star models, and it features a rounded three-link design that tapers from 22mm at the lugs down to 20mm on the underside of the wrist. The links are completely solid, the clasp latches with a button-operated release system, and the end-links connect to the lugs with integrated quick-release springbars to facilitate tool-free strap changes. With that in mind, the bracelet is ultimately a fairly basic design within the context of modern dive watches, and its removable links are secured by friction-fit pins; the clasp lacks any type of integrated extension system, and the central portions of its end-links extend a decent way past the lugs, which increases the overall lug-to-lug profile of the watch.
The other configuration for the Delma Shell Star 41mm pairs the model with a black two-piece rubber strap, which features contrast stitching running down its two sides that mirrors the colorway of the specific model. Similar to the bracelet, the rubber strap features a 22mm to 20mm taper with integrated quick-release springbars, and it secures on the underside of the wrist with a properly chunky tang-style buckle that is signed with Delma’s logo. Between the two available configurations, I slightly prefer the rubber strap, but since the Shell Star 41mm has standard 22mm lugs, I’d likely still opt for the bracelet, and then experiment with a near-endless variety of third-party straps that will also be compatible with its case.
At its core, the Delma Shell Star 41mm is a smaller and more wearable execution of the brand’s quintessential dive watch, but it also introduces a new versatile foundation to Delma’s modern catalog, which can later be adapted to create future models. The standard 44mm Shell Star Automatic serves as the foundation for the brand’s Oceanmaster Lume sailing watch, and my biggest critique of that model was simply that it retained dive-specific features like a helium escape valve and 500-meter depth rating, which detracted from its sailing-inspired concept. Had the Shell Star 41mm existed back when Delma created the Oceanmaster, I can only imagine that it would have served as the foundation for Delma’s sailing watch, and since the Shell Star 41mm offers a much more versatile canvas, I could easily see Delma creating other types of sports watches that are based on the same 41mm blueprint.
Pricing for the Delma Shell Star 41mm series largely mirrors what can be observed among their larger 44mm counterparts, with the quartz versions priced at $750 USD on a strap and $800 USD on a bracelet, while the automatic models are naturally more expensive at $1,300 USD in a strap-equipped configuration and $1,350 USD when paired with a bracelet. Despite its reduced water resistance and lack of a helium escape valve, the Shell Star 41mm is still more than capable of serving as a proper dive watch, but its compact profile makes it better suited for everyday life on dry land than any of its deeper-diving siblings. Given that the vast majority of scuba diving occurs in less than 30 meters of water, I’m more than content with a 200-meter depth rating, and I will gladly trade some water resistance for a more comfortable and wearable execution of Delma’s fan-favorite model. For more information, please visit the Delma Watches website.