What kind of watch is the Seiko Astron Nexter? Introducing our recommendations from current models!

The Seiko Astron "Nexter" is an innovative watch that combines cutting-edge technology, including GPS solar, with sophisticated design. It provides accurate timekeeping anywhere in the world and is suitable for a wide range of occasions, from business to casual wear. The latest models in particular feature dual time display and chronograph functions, making this a lineup that combines functionality and style. In this article, we will introduce a carefully selected list of recommended current models.

What is the Seiko Astron "Nexter"?

　In 1969, Seiko brought the world's first quartz wristwatch, the "Quartz Astron," to market, ushering in a major revolution for the era. This challenge, which saw the evolution of wristwatches from precision machinery to electronic control, eventually led to the creation of the GPS solar watch in 2012. Receiving signals from GPS satellites and automatically adjusting the local time, the Seiko Astron became ideal for business people who travel a lot, and the series has become recognized worldwide as a symbol of Seiko's technological prowess.

　The "Nexter" series marks the 10th anniversary of the Seiko Astron, marking a new stage in its evolution. Unconstrained by traditional user profiles, the Nexter series responds to the rapidly changing business environment and values ​​by targeting a new generation of "next-generation leaders." The compact yet stately form, smart fit, and subdued colors that complement a jacket style perfectly harmonize with the image of a modern person who combines intelligence and flexibility.

　The watches are equipped with two main types of movements: the Cal. 5X83, a GPS satellite wave correction system that combines light operability with high accuracy, and a standard radio wave correction system that does not use GPS for time correction. On the exterior, the edgy case lines and detailed hairline finish create a solid impression and sophisticated beauty. Furthermore, the dial's three-dimensional indexes and contrasting inset dials, as well as the design that enhances the unity with the bracelet, are highly refined both visually and functionally. Nexter is a culmination of the technology Seiko Astron has built up, yet can be described as a new-generation GPS solar watch that directly responds to the values ​​of the generations that will lead the future.

5 Recommended Seiko Astron "Nexter" Models

　We've carefully selected five recommended models from the Seiko Astron "Nexter" series, which combines modern technology with beauty, and we'll introduce them here, each with outstanding design and functionality.

Ref. SBXC159 equipped with a new movement

　In 2024, the previous Caliber 5X series of movements was revamped, resulting in the more advanced Caliber 5X83. The new mechanism featured a dual time display and a stopwatch capable of measuring 1/20th of a second, and also sped up the conventional time transfer function. One of the first models to feature this movement was the Nexter GPS Solar Dual Time Chronograph.

　The Ref. SBXC159, in particular, boasts a titanium bezel and a 42mm case size, resulting in a sharp design and a light, comfortable feel. The exterior is treated with a DiaShield coating, providing both durability and a luxurious feel. The vertical three-subdial arrangement allows for the simultaneous display of the chronograph function of the center second hand and a second time zone, achieving both excellent visibility and a well-balanced layout. Furthermore, the sapphire crystal and flat crystal reduce light reflection, allowing the dial to be enjoyed from any angle.

　Another appealing feature of the Ref. SBXC159 is the texture of its silver-toned dial. Its structure, which allows light to pass through while taking advantage of the lustre of the reflector, eliminates the "transparency" of the internal parts, a common issue with solar-powered watches. The vertical graining and circular pattern on the subdials add a three-dimensional feel and intellectual nuance to the overall design, and optimized motor placement ensures smooth and fast hand movement, resulting in a watch that combines sharp looks with easy operability. This model, which combines technology and design, is a masterpiece that symbolizes the evolution of the Astron.

Reference SBXC175 with a sapphire crystal bezel

　The Ref. SBXC175 is a watch that redefines the concept of conventional GPS solar watches. This model, introduced as a new model in 2025, also features the Cal. 5X83 movement, which accurately corrects the time. While boasting a striking design, it also features satellite-based time zone correction and dual time display, as well as operability and durability ideal for everyday use.

　Its greatest appeal is the transparency and luster of the sapphire crystal used for the bezel. This depth of expression, not possible with conventional metal materials, gives the Ref. SBXC175 a sense of luxury and refined individuality. The combination with the titanium case, with its mirror-polished slopes, is also not to be missed, blending elegance into a sporty look. Furthermore, the dual-curved sapphire crystal is clear-coated, achieving a design that combines visibility with aesthetic appeal.

　The Ref. SBXC175 skillfully combines boldness and elegance, making it versatile enough to be worn with any outfit. The five-row bracelet features an exquisite blend of polished and hairline finishes, creating a three-dimensional look and a high-quality texture on the wrist. Various functions, including automatic GPS correction, a stopwatch, and a perpetual calendar, can be operated intuitively. This model, which combines high precision and aesthetics, breathes new charm into the Seiko Astron.

The all-black Ref. SBXC179 gives off a bold impression.

　The SBXC179, a new model for 2025, is an eye-catching model with an all-black style. The subdued, heavy body instills confidence in the wearer while embodying refined functional beauty. The coloring blends in with both urban and natural surroundings, adding a quiet presence to your wrist no matter the occasion.

　The case and bezel are made of pure titanium with a highly scratch-resistant Black Dia Shield finish. The bezel display is combined with sapphire crystal, creating a sense of depth and transparency, enhancing the watch's modern look. The dual-curved crystal is clear-coated for improved visibility, and its appearance changes depending on the angle of the light. The bracelet also features a one-push design for easy fastening and removal, and a smart adjuster for a comfortable fit. This is a watch that pursues high quality down to the finest details of its finish.

　The heart of the Ref. SBXC179 is the Cal. 5X83 movement, boasting a full range of specifications, including a chronograph with second-by-second accuracy and dual time display. Its reliable features include a world time function with 38 time zones, a stopwatch capable of measuring time to 1/20th of a second, and a perpetual calendar that will require no adjustment until 2100. Smooth mode switching and hand movement ensure stress-free, comfortable operation. The fusion of strength and technology in the black finish highlights the image of a next-generation leader.

Ref. SBXY095 features a distinctive "panda" dial

　The Ref. SBXY095 features a classic "panda" face, combining practicality with a playful spirit. The white dial and black subdials create a powerful visual reminiscent of a sports chronograph. Its modest size of 41.3mm and slim profile of 10.6mm make it a very sleek timepiece. The lightweight titanium case and sophisticated color scheme combine to create a versatile piece that can be worn both on and off the job.

　This model is equipped with the Cal. 8B92 movement, which uses standard radio waves instead of GPS. It receives time signals from base stations in Japan, the United States, Germany, and China, automatically adjusting the time and calendar for reliable operation. It also boasts multiple functions, including a stopwatch and world time, but is simple and easy to use. It also features overcharge prevention and power saving functions, and can run for approximately six months on a full charge. Despite its eye-catching appearance, this watch boasts solid specs.

　The case is made of lightweight, durable titanium and features a DiaShield coating for scratch resistance. The crystal is made of sapphire crystal with a super clear coating, ensuring both visibility and durability. Details such as the screw-lock crown at 5 o'clock, the easy-to-fasten push-button buckle, and the selection of hypoallergenic materials highlight the watch's design, which is designed with everyday use in mind. The Ref. SBXY095 is a modern entry-level model that allows you to enjoy Astron's technology and design up close.

Ref. SBXD023 with a celestial motif dial

　The Ref. SBXD023 is a unique model among the Seiko Astron models. The dial features a sand-grained pattern reminiscent of the surface of a planet, and the deep blue color lends a mystical presence to the wrist. The earth-inspired color tone and texture are more than just a design; they seem to evoke a respect for nature and the universe. The boldly hollowed-out center of the thick hour and minute hands and the imposing indices ensure high visibility and also function as effective visual accents.

　What sets this model apart is its two-layered bezel, constructed from a combination of different materials. Six slits carved into the upper aluminum layer allow a subtle peek at the metal underneath, creating a three-dimensional design with a unique aesthetic reminiscent of industrial products of the near future. Furthermore, the chamfering on each link of the bracelet creates delicate shadows depending on how the light hits it, portraying a variety of different expressions depending on the angle from which it is viewed. This meticulous craftsmanship underpins the luxury feel.

　The Ref. SBXD023 is equipped with the high-performance Cal. 3X62 movement, which automatically adjusts the local time using satellite radio waves. In addition to receiving accurate time anywhere in the world, it also offers a variety of useful functions for everyday life, such as a perpetual calendar and power reserve indicator. The slim case, just 12mm thick, provides a light and comfortable feel, and the pure titanium case is lightweight yet highly durable. Combining precision, comfort, and cosmic romance, this model is a fusion of Seiko Astron's innovative spirit and poetic sensibility.