Halios Seaforth Series IV: what does its owner think?

The Halios Seaforth Series IV, launched in 2022, represents the fourth evolution of the dive watch that has become emblematic of the small independent Canadian brand Halios, based in Vancouver and run by Jason Lim. Production was announced in 2022 before deliveries extended mainly from the end of that year through 2023, followed by additional batches over subsequent years. Series IV retains the simple formula that has made the Seaforth successful since 2017: a no-date three-hand display, strong water resistance, relatively compact proportions and a choice between a very clean fixed bezel or a rotating bezel giving it more of the appearance of a true dive watch.

The generation notably introduced steel or titanium cases depending on the production batch, coloured lacquered dials, moulded luminous hour markers and a Sellita automatic movement. Production subsequently evolved, particularly with the arrival of a dedicated metal bracelet and, on the most recent batches, a new generation of the Sellita SW200 providing approximately 65 hours of power reserve. Assembly and final testing are carried out in Vancouver.

Design & legibility: minimalism, colour and light

The Seaforth Series IV is built around a deliberately uncluttered dial. There is no date, no Arabic numeral and no complication likely to distract from the hours, minutes and seconds. The geometric hour markers are generously sized and paired with straight hands featuring a matte finish, while the peripheral minute track remains discreet enough not to overload the display. The dials were one of the principal attractions of Series IV from the beginning: Pastel Blue, Bahama Yellow, Pink and No-Fuss Black gave the watch a much more playful identity than a traditional dive watch. Additional shades subsequently joined the range. The three-dimensional luminous hour markers are one of the most remarkable distinguishing features of this generation. Halios currently uses Globolight XP markers combined with Super-LumiNova on the hands and bezel elements. Their volume gives the dial depth in daylight and creates particularly clear reading in darkness. The double-domed sapphire crystal with anti-reflective coating further enhances the depth of the dial and visually recalls certain domed crystals used on older dive watches. Depending on configuration, the bezel can be fixed and almost entirely free of indications or rotating with a sapphire insert and luminous markings.

Case, bracelet and comfort: two personalities around the same format

Series IV is built around proportions designed to maintain a sporting presence without becoming cumbersome. Contemporary configurations measure approximately 40 mm with a fixed bezel and 41 mm with a rotating bezel, with 46.5 mm between the ends of the lugs, a 20 mm lug width and approximately 12.4 mm thickness including the crystal. The caseback and crown screw down and stated water resistance reaches 20 atmospheres, or 200 metres. Early Series IV watches existed in stainless steel and titanium, while the production currently offered by Halios mainly focuses on titanium. The combination of a 46.5 mm length and a titanium case makes the watch considerably easier to wear than its dive-watch appearance might suggest. Titanium provides reduced weight and a slightly darker colour than steel, while steel offers greater density on the wrist. The first deliveries were mainly paired with a rubber strap shaped to fit the case. Halios later developed a dedicated metal bracelet, notably in titanium, with screwed links and a clasp allowing fast tool-free micro-adjustment. Drilled lug holes and the standard 20 mm lug width also make it easy to use universal leather, textile or rubber straps when a completely different character is desired.

Movement: from the SW200-1 to the SW200-2 Power+

The first Series IV watches are equipped with the automatic Sellita SW200-1 in a no-date configuration. This Swiss calibre operates at 28,800 vibrations per hour, uses 26 jewels and belongs to a mechanical family widely used by independent watch brands. Its autonomy is approximately 38 to 40 hours depending on the documented version. Halios removed the date display and, on correctly adapted configurations, the unnecessary crown position commonly known as a “ghost date”. Current production uses the Sellita SW200-2 in its Power+ version, increasing the stated power reserve to approximately 65 hours while retaining a simple hours, minutes and seconds display. The move to approximately 65 hours of autonomy corrects one of the principal practical limitations of the earliest Series IV watches. A watch removed on Friday evening consequently has a greater chance of still running after a weekend without wear. The 4 Hz frequency provides a smooth progression of the seconds hand and represents an architecture familiar to watchmakers. The exact accuracy guaranteed for every individual example is not communicated and can vary with adjustment, position and movement condition. The conventional construction of the Sellita nevertheless represents a long-term advantage over an exclusive calibre whose parts might be difficult to obtain.

Chronological milestones and main models (2022–2025)

(2022) Halios Seaforth Series IV Bahama Yellow Fixed Bezel:

The Bahama Yellow dial is one of the configurations that immediately gave the fourth generation its own identity. Its strong yellow colour, sometimes appearing slightly orange depending on the light, contrasts sharply with the darker hands and luminous hour markers. In fixed-bezel configuration, the watch abandons much of the traditional visual vocabulary of a dive watch and resembles a versatile sports watch, while retaining a screw-down crown and 200 metres of water resistance. The case was offered in steel or titanium during the early batches and the crystal remains double-domed sapphire. The automatic Sellita SW200-1 provides a no-date display and approximately 38 to 40 hours of autonomy. It is identified as Halios Seaforth Series IV Bahama Yellow Fixed Bezel. On black rubber, yellow becomes the visual centre of the watch; with textile or leather, the model can easily take on a more everyday character.

(2022) Halios Seaforth Series IV Pastel Blue 12-Hour Bezel:

Pastel Blue continues a colour already closely associated with Halios and with certain previous generations of the Seaforth. The light tone of the dial gives a less instrumental impression than conventional black and allows the luminous hour markers to remain particularly visible during the day. With a rotating 12-hour bezel, the watch can be used to follow an approximate second time zone by positioning the scale according to the desired offset, even though it does not have a genuine GMT hand. This configuration retains 200 metres of water resistance, a double-domed sapphire crystal and a no-date automatic Sellita SW200-1. The rotating bezel uses 120 positions on documented configurations and its dark insert creates a particularly strong frame around the pastel-blue dial. The full designation remains Halios Seaforth Series IV Pastel Blue 12-Hour Bezel.

(2022) Halios Seaforth Series IV Pink Fixed Bezel:

The pink dial is one of the boldest proposals from the initial Series IV release. Halios pairs it with the same minimalist design as the other colours: widely spaced markers, simple hands, no date aperture and a discreet logo at 12 o’clock. The fixed-bezel version concentrates even more attention on the colour because no peripheral scale interrupts the visual transition between dial and case. Examples have notably existed in titanium, whose subdued dark-grey tone provides an interesting contrast with the much brighter dial. The approximately 40 mm format, short lug span and flexible strap reduce the impression of a large watch despite the strong colour presence. Inside, the automatic Sellita SW200-1 provides hours, minutes and seconds. It is identified here as Halios Seaforth Series IV Pink Fixed Bezel reference not communicated. It particularly illustrates Halios’s willingness to offer a technically serious tool watch without imposing the traditionally restrained colours of the category.

(2023) Halios Seaforth Series IV Bahama Yellow Diver Bezel:

By combining the Bahama Yellow dial with a dark dive bezel, this version takes on a considerably more instrumental personality than the fixed-bezel model. The sapphire insert receives an elapsed-time scale intended to measure a duration from the bezel’s starting position, while the luminous markings remain visible as ambient light decreases. The bezel turns in one direction through 120 positions, an arrangement suited to the traditional purpose of a dive watch. The case measures approximately 41 mm on the modern rotating configuration, while length remains restrained at around 46.5 mm. Water resistance of 200 metres, screw-down crown and screw-down caseback make the watch suitable for swimming and recreational diving when water resistance has been checked. Early examples use the no-date Sellita SW200-1. It is designated Halios Seaforth Series IV Bahama Yellow Diver Bezel. The yellow-and-black contrast makes it one of the most immediately recognisable configurations of Series IV.

(2023) Halios Seaforth Series IV No-Fuss Black Fixed Bezel:

No-Fuss Black represents the most understated interpretation of Series IV. Its name summarises the objective: a glossy or deeply dark black dial depending on the light, three hands, no date aperture and a fixed bezel reducing the visual elements to the essentials. This version particularly highlights the three-dimensional luminous markers and the clean outlines of the hands. It has been produced in both steel and titanium during the commercial life of the series, with 200 metres of water resistance and a double-domed sapphire crystal. The automatic Sellita SW200-1 used in early production retains a frequency of 28,800 vibrations per hour and approximately 40 hours of reserve. The black dial also makes this configuration highly flexible for straps: rubber, brown leather, textile or metal can all work without a significant colour conflict. It is designated Halios Seaforth Series IV No-Fuss Black Fixed Bezel. For discreet daily use, it is probably one of the easiest combinations in the family to wear.

(2025) Halios Seaforth Series IV Verglas White Titanium Bracelet:

The 2025 evolution notably introduces a white execution often called Verglas White and, above all, the metal bracelet that many Seaforth enthusiasts had been waiting for across several generations. The titanium case retains the compact proportions of Series IV but receives more elaborate finishing, with brushed surfaces, polished bevels and particularly clean transitions. The bracelet also primarily uses titanium and ends in a clasp with fast tool-free micro-adjustment. The white lacquered dial increases the contrast with the darker elements of the hands and Globolight hour markers. Depending on configuration, this version can receive either a fixed bezel or a rotating bezel with a sapphire insert. The movement used on documented deliveries from this period remains the Sellita SW200-1 before the later move to the SW200-2 Power+.

(2025) Halios Seaforth Series IV Full Lume Diver:

The Series IV Full Lume takes the search for night-time visibility considerably further than the standard dials. Instead of limiting luminous material to the hour markers and hands, a large part of the dial itself becomes luminous, creating after exposure to light a glowing surface against which the indications stand out. Documented examples have notably been produced in titanium with a rotating dive bezel, double-domed sapphire crystal and 200 metres of water resistance. Three-dimensional markers add a second level of luminous material and create particularly pronounced depth when the watch moves from a bright environment into darkness. This execution remains mechanically simple with an automatic Sellita movement, three hands and no date. It was distributed in smaller quantities than the regular colours. It is identified as Halios Seaforth Series IV Full Lume Diver reference not communicated. It is aimed primarily at someone who considers lume to be a design element in its own right rather than merely a night-time function.

(2025) Halios Seaforth Series IV No-Fuss Black Titanium Bracelet:

The combination of a No-Fuss Black dial, titanium case and new metal bracelet probably represents one of the most versatile expressions of the recent Series IV. The black dial removes the strong colour effects of Bahama Yellow, Pink or Pastel Blue and places more emphasis on the quality of the markers, hands and domed crystal. With a fixed bezel, the diameter remains close to 40 mm and the 46.5 mm length helps it fit a broad range of wrists. The titanium bracelet significantly reduces mass compared with an equivalent steel construction and its micro-adjustment allows tension to be corrected quickly as the wrist changes size during the day. Documented 2025 examples still use the Sellita SW200-1 with approximately 40 hours of reserve before the later move to Power+. The full designation retained here is therefore Halios Seaforth Series IV No-Fuss Black Titanium Bracelet.

Choosing the right version: size, variants, straps and use

The first choice concerns the bezel. The fixed version is simpler, visually slightly more compact and transforms the Seaforth into a versatile sports watch rather than an immediately recognisable diver. The rotating bezel is preferable if elapsed-time measurement is actually used or if the traditional appearance of a dive watch is desired. The 12-hour bezel provides an additional useful function for approximately tracking a second time zone. In every case, the 200 metres of water resistance remain available regardless of the style chosen.

Case material significantly changes the sensation. Steel is heavier, brighter and gives a traditional feeling of density on the wrist. Titanium is lighter and possesses a greyish tone that can work especially well with yellow, pink or blue dials. For someone wearing the watch throughout the day, titanium is probably the most comfortable choice. It can, however, develop marks differently from steel, and those who appreciate a heavy and highly present watch may sometimes prefer the early stainless-steel Series IV models.

For colour, No-Fuss Black is the easiest option with a varied wardrobe and can become a genuine everyday watch. Pastel Blue provides the chromatic signature most immediately associated with Halios, while Bahama Yellow and Pink offer greater personality. Highly coloured dials are particularly interesting in a collection that already contains several black, dark-blue or silver watches. Full Lume prioritises a spectacular night-time experience, while the white or grey dials of more recent batches provide a more neutral alternative.

The bracelet should also be included in the initial decision. The early rubber straps are flexible, water-resistant and well suited to the sporting purpose of the watch. The recent titanium bracelet significantly changes the impression of quality and benefits from fast micro-adjustment that is particularly useful during warm days. The 20 mm lug width nevertheless remains a major advantage for experimenting easily with third-party straps. Textile makes the watch more casual, leather can soften its dive-watch character and rubber remains the most logical choice for the sea or swimming pool.

Finally, movement generation should be considered if power reserve matters. Early Series IV watches with the SW200-1 provide approximately 38 to 40 hours, which is perfectly suitable for a watch worn daily but less convenient in a weekend rotation. Current production with the SW200-2 Power+ reaches approximately 65 hours and is more practical when alternated with other watches. On the pre-owned market, condition, movement regulation and exact configuration nevertheless matter more than a theoretical difference in power reserve. The limited availability of certain colours can also have a significant influence on the final choice. Other customers’ opinions are essential.

Conclusion

The Halios Seaforth Series IV is aimed at someone seeking an independent sports watch whose design remains simple but whose details are particularly carefully executed. Its 40 to 41 mm format, restrained length, 200 metres of water resistance and absence of a date make it easy to use every day without limiting it to the role of a dive watch. Fixed, 12-hour or elapsed-time bezels create genuinely different personalities, while Pastel Blue, Bahama Yellow, Pink, Black, White or Full Lume dials allow the watch to range from considerable restraint to much more original expression. Early steel or titanium versions equipped with the SW200-1 remain very close to the initial philosophy of Series IV, while more recent production adds the metal bracelet and improved mechanical autonomy. The choice therefore depends as much on dial and bezel type as on material and generation.

To compare these technical qualities with real owner experiences of comfort, finishing, accuracy and wrist enjoyment, Dialicious customer reviews provide a particularly useful complement.

(Updated August 2026)